(b) Duties.—Internally, the minister is bound _sub levi_ to be in the state of grace, and _sub gravi_ to be free from censures (such as suspension) which forbid him the exercise of the ministry. Externally, he must observe the church laws on the manner, time and place for distribution of the Sacrament (Canons 851, 852, 867-869), and also the liturgical rules for Communion during and outside of Mass, for Communion of the sick and the dying, and for the avoidance of defects in giving Communion (Rituale Rom., Tit. IV; Missale Rom., de defectibus Missae).
2704. The Recipient of the Eucharist.—(a) Those Who May Receive Communion.—According to divine law, every living person who has received Baptism of water is capable of receiving the Eucharist, infants and the insane not excluded. Ecclesiastical law requires other conditions, which are justified by considerations of respect for the Blessed Sacrament or other good reason. Communion may not be given, first, to those who have not the use of reason (i.e., to infants and the perpetually insane), nor to those who are unable to understand the essential truths of religion and morality (i.e., to those who have always been deaf and dumb or blind, and who are uninstructed); for, on the one hand, the Sacrament is not necessary for these persons, and, on the other hand, there is great danger of irreverence if it be given them. Secondly, Communion may not be given to those who cannot receive without grave peril of unbecoming treatment of the Sacrament, as in the case of those who cough or vomit continually or frequently, or of those who are delirious, or unconscious, or insane, But if the danger is certainly slight (e.g., if the person can swallow an unconsecrated host without spitting it out), Communion may be given, at least the Viaticum or Easter Communion. Next those persons are denied Communion who cannot receive without scandal (e.g., those who are infamous, such as prostitutes or defamers, persons intoxicated or insufficiently dressed). Finally, no one may receive Communion who has already received it that day, lest the Sacrament become common and be taken without due preparation; but exception is made when it is necessary to communicate a second time in order to comply with the divine law of receiving Viaticum or of saving the Host from profanation (Canons 853-858).
(b) Those Who Must Receive Communion.—There is a divine precept that adults receive the Eucharist worthily (John, vi. 54). It obliges _per se_, when one is certainly or almost certainly in proximate danger of death, unless one has recently (that is, according to some, within a week’s time) received Communion; for this Sacrament is the wayfarer’s provision for his journey to eternity. It obliges also now and then during life, since the Eucharist is man’s spiritual nourishment for the journey of life. It obliges _per accidens_, when Communion is necessary to avoid grave sin, for charity to self obliges one to use the means without which serious spiritual harm cannot be escaped. The church law determines the details for the fulfillment of the divine precept. All the faithful who have reached the age of reason, even though they be under seven years, must fulfill the yearly Easter duty (see 2592, 2593). In reference to First Communion, the Church requires that children who are not in danger of death must have a mental and moral fitness, consisting in a knowledge of the chief mysteries of faith and a devotion towards the Eucharist such as is possible at their time of life. In reference to the last Communion, or Viaticum, the Code declares that it is obligatory, no matter what be the cause of the danger of death; it reminds us that the duty should not be put off too long; it recommends that the Viaticum be administered even to those who had communicated the same day before the danger of death arose, and that it be given on distinct days during the danger. For children who are in danger of death it suffices that they are able to distinguish the Eucharist from ordinary food and to adore it reverently (Canons 859-865, 854).
2705. Dispositions for Worthy Communion.—(a) Dispositions of Soul.—The divine law requires the state of grace (I Cor., xi. 27 sqq.), and probably also the previous sacramental confession which the Church prescribes _sub gravi_ for one who is conscious of serious sin not yet remitted through absolution. But he is excused from the duty of previous confession who cannot omit Communion now (e.g., because while at the rails he remembers a grave sin and cannot leave without being disgraced) and who is unable to go to confession (see 2701 c). The recipient must also have a knowledge of the Sacrament suited to his mental capacity, and he must desire it, at least habitually. Since the Sacraments are fruitful in proportion to the cooperation given them, and since the presence and visit of Christ deserves honor and recognition, Communion should be received devoutly, and should be preceded by a preparation and followed by a thanksgiving (Canons 856, 731). The faithful may receive in any Rite, but their own Rite is advised for Easter Communion and strongly urged for the Viaticum (Canon 866).
(b) Dispositions of Body.—The communicant must observe the Eucharistic fast and must conduct himself with external reverence.
By ecclesiastical law a person is bound to the fasting from midnight to receive the Holy Eucharist lawfully (Canons 808, 858). Despite the changes made by the Apostolic Constitution, _Christus Dominus_ (Jan. 16, 1953) and the _Motu Proprio, “Sacram Communionem_” (Mar. 19, 1957), priests and the faithful who are able to do so are exhorted to observe this venerable and ancient form of Eucharistic fast before Mass or Holy Communion. The legislation of these two papal documents, intended to increase devotion to the Blessed Sacrament by fostering frequent Communion, decrees:
1) that natural water does not break the fast;
2) that the period for observing the Eucharist fast before Mass, at whatever hour it may be said (morning, afternoon, midnight), is three hours from solid food and alcoholic beverages, and one hour from non-alcoholic beverages. The priest who is to celebrate computes his time from the beginning of Mass; the faithful, from the time of Communion;
3) that the sick, although not confined to bed, may consume non-alcoholic beverages and real and appropriate medicines, liquid or solid, without any restriction of time.
The Eucharistic fast is based on primitive tradition and is enjoined by the Church as a grave obligation that admits of no lightness of matter. The fast is violated by the smallest portion of food or alcoholic drink. Food is any solid which the physician considers digestible or alterable by the stomach, and hence the fast is not broken if wood, string, paper, hairs or fingernails are swallowed. But the food or drink must be eaten or drunk, that is, it must come from outside the mouth and be taken into the stomach in the way of consumption, and hence the fast is not broken by what comes from within the mouth (e.g., blood from the gums, food remaining in the teeth from the previous day) or by what is taken into the stomach in the way of saliva (e.g., the accidental remnants of a mouth wash or of a throat gargle, or spray, or of a chew of tobacco or gum, when one has spit out the contents as much as possible), or in the way of breathing (e.g., snuff, tobacco smoke inhaled, an insect or a raindrop blown into the mouth). A solid, like a caramel, however, which is dissolved in the mouth before it is swallowed, can not be considered as a liquid. The liquid of the _Sacram Communionem_ must be a liquid before it enters the mouth. (See “Some Further Elucidations on Sacram Communionem” by Cardinal Ottaviani, _American Ecclesiastical Review_, Vol. CXXXXVII, No, 2, August 1957, p. 74.)