Reply Obj. 7: The Lord commanded an altar to be made for the offering of sacrifices and gifts, in honor of God, and for the upkeep of the ministers who served the tabernacle. Now concerning the construction of the altar the Lord issued a twofold precept. One was at the beginning of the Law (Ex. 20:24, seqq.) when the Lord commanded them to make "an altar of earth," or at least "not of hewn stones"; and again, not to make the altar high, so as to make it necessary to "go up" to it "by steps." This was in detestation of idolatrous worship: for the Gentiles made their altars ornate and high, thinking that there was something holy and divine in such things. For this reason, too, the Lord commanded (Deut. 16:21): "Thou shalt plant no grove, nor any tree near the altar of the Lord thy God": since idolaters were wont to offer sacrifices beneath trees, on account of the pleasantness and shade afforded by them. There was also a figurative reason for these precepts. Because we must confess that in Christ, Who is our altar, there is the true nature of flesh, as regards His humanity—and this is to make an altar of earth; and again, in regard to His Godhead, we must confess His equality with the Father—and this is "not to go up" to the altar by steps. Moreover we should not couple the doctrine of Christ to that of the Gentiles, which provokes men to lewdness.
But when once the tabernacle had been constructed to the honor of God, there was no longer reason to fear these occasions of idolatry. Wherefore the Lord commanded the altar of holocausts to be made of brass, and to be conspicuous to all the people; and the altar of incense, which was visible to none but the priests. Nor was brass so precious as to give the people an occasion for idolatry.
Since, however, the reason for the precept, "Thou shalt not go up by steps unto My altar" (Ex. 20:26) is stated to have been "lest thy nakedness be discovered," it should be observed that this too was instituted with the purpose of preventing idolatry, for in the feasts of Priapus the Gentiles uncovered their nakedness before the people. But later on the priests were prescribed the use of loin-cloths for the sake of decency: so that without any danger the altar could be placed so high that the priests when offering sacrifices would go up by steps of wood, not fixed but movable.
Reply Obj. 8: The body of the tabernacle consisted of boards placed on end, and covered on the inside with curtains of four different colors, viz. twisted linen, violet, purple, and scarlet twice dyed. These curtains, however, covered the sides only of the tabernacle; and the roof of the tabernacle was covered with violet-colored skins; and over this there was another covering of rams' skins dyed red; and over this there was a third curtain made of goats' hair, which covered not only the roof of the tabernacle, but also reached to the ground and covered the boards of the tabernacle on the outside. The literal reason of these coverings taken altogether was the adornment and protection of the tabernacle, that it might be an object of respect. Taken singly, according to some, the curtains denoted the starry heaven, which is adorned with various stars; the curtain (of goats' skin) signified the waters which are above the firmament; the skins dyed red denoted the empyrean heaven, where the angels are; the violet skins, the heaven of the Blessed Trinity.
The figurative meaning of these things is that the boards of which the tabernacle was constructed signify the faithful of Christ, who compose the Church. The boards were covered on the inner side by curtains of four colors: because the faithful are inwardly adorned with the four virtues: for "the twisted linen," as the gloss observes, "signifies the flesh refulgent with purity; violet signifies the mind desirous of heavenly things; purple denotes the flesh subject to passions; the twice dyed scarlet betokens the mind in the midst of the passions enlightened by the love of God and our neighbor." The coverings of the building designate prelates and doctors, who ought to be conspicuous for their heavenly manner of life, signified by the violet colored skins: and who should also be ready to suffer martyrdom, denoted by the skins dyed red; and austere of life and patient in adversity, betokened by the curtains of goats' hair, which were exposed to wind and rain, as the gloss observes.
Reply Obj. 9: The literal reason for the sanctification of the tabernacle and vessels was that they might be treated with greater reverence, being deputed, as it were, to the divine worship by this consecration. The figurative reason is that this sanctification signified the sanctification of the living tabernacle, i.e. the faithful of whom the Church of Christ is composed.
Reply Obj. 10: Under the Old Law there were seven temporal solemnities, and one continual solemnity, as may be gathered from Num. 28, 29. There was a continual feast, since the lamb was sacrificed every day, morning and evening: and this continual feast of an abiding sacrifice signified the perpetuity of Divine bliss. Of the temporal feasts the first was that which was repeated every week. This was the solemnity of the "Sabbath," celebrated in memory of the work of the creation of the universe. Another solemnity, viz. the "New Moon," was repeated every month, and was observed in memory of the work of the Divine government. For the things of this lower world owe their variety chiefly to the movement of the moon; wherefore this feast was kept at the new moon: and not at the full moon, to avoid the worship of idolaters who used to offer sacrifices to the moon at that particular time. And these two blessings are bestowed in common on the whole human race; and hence they were repeated more frequently.
The other five feasts were celebrated once a year: and they commemorated the benefits which had been conferred especially on that people. For there was the feast of the "Passover" in the first month to commemorate the blessing of being delivered out of Egypt. The feast of "Pentecost" was celebrated fifty days later, to recall the blessing of the giving of the Law. The other three feasts were kept in the seventh month, nearly the whole of which was solemnized by them, just as the seventh day. For on the first of the seventh month was the feast of "Trumpets," in memory of the delivery of Isaac, when Abraham found the ram caught by its horns, which they represented by the horns which they blew. The feast of Trumpets was a kind of invitation whereby they prepared themselves to keep the following feast which was kept on the tenth day. This was the feast of "Expiation," in memory of the blessing whereby, at the prayer of Moses, God forgave the people's sin of worshipping the calf. After this was the feast of "Scenopegia" or of "Tents," which was kept for seven days, to commemorate the blessing of being protected and led by God through the desert, where they lived in tents. Hence during this feast they had to take "the fruits of the fairest tree," i.e. the citron, "and the trees of dense foliage" [*Douay and A. V. and R. V. read: 'Boughs of thick trees'], i.e. the myrtle, which is fragrant, "and the branches of palm-trees, and willows of the brook," which retain their greenness a long time; and these are to be found in the Land of promise; to signify that God had brought them through the arid land of the wilderness to a land of delights. On the eighth day another feast was observed, of "Assembly and Congregation," on which the people collected the expenses necessary for the divine worship: and it signified the uniting of the people and the peace granted to them in the Land of promise.
The figurative reason for these feasts was that the continual sacrifice of the lamb foreshadowed the perpetuity of Christ, Who is the "Lamb of God," according to Heb. 13:8: "Jesus Christ yesterday and today, and the same for ever." The Sabbath signified the spiritual rest bestowed by Christ, as stated in Heb. 4. The Neomenia, which is the beginning of the new moon, signified the enlightening of the primitive Church by Christ's preaching and miracles. The feast of Pentecost signified the Descent of the Holy Ghost on the apostles. The feast of Trumpets signified the preaching of the apostles. The feast of Expiation signified the cleansing of the Christian people from sins: and the feast of Tabernacles signified their pilgrimage in this world, wherein they walk by advancing in virtue. The feast of Assembly or Congregation foreshadowed the assembly of the faithful in the kingdom of heaven: wherefore this feast is described as "most holy" (Lev. 23:36). These three feasts followed immediately on one another, because those who expiate their vices should advance in virtue, until they come to see God, as stated in Ps. 83:8. ________________________
FIFTH ARTICLE [I-II, Q. 102, Art. 5]