Psalm 19 contains two short nature hymns or more probably two fragments of hymns. The first Psalm 19:1-5b seems to be a hymn of the night. It does not call upon the heavens to praise God, as the typical hymn would do, but simply announces that the heavens do declare God’s glory. This they do without language or words or sounds over all the earth, ceaselessly declaring his glory from day to day, from night to night, from age to age. Psalm 19:5c-7 has no introductory nor concluding call to praise, and the few lines that we have, effective though they are, are probably only a fraction of the body of the original hymn. Moreover the original was undoubtedly a hymn to Shamash the Assyrian Sun God. The Assyrians watched with reverent eye the Sun God’s glorious journey across the heavens. They knew also of his wearisome return in the underworld from West to East, and they were glad to think of the bride and the repast awaiting him in his tent on the edge of the heavenly ocean. The Hebrew like the Assyrian had great admiration for the illuminating rays and the fervent heat of the sun, but he would go no further than to compare the sun to a bridegroom, and a strong man. It does seem strange that the psalmist has retained in verse 4c the sun’s tent: “For the sun he hath set a tent in the sea,” but even so it is Yahwe who has placed the tent there, even as it is Yahwe who has placed the sun in the heavens. The Hebrew who used this fragment of a poem saw God’s glory revealed in the progress of the sun across the sky by day, even as he saw that glory revealed in the star studded heavens by night.
Psalm 104 differs from the standard Hebrew hymns of praise in two respects. It is addressed in considerable part directly to Deity in the second person, while the standard Hebrew hymn regularly uses the third person. Also it has a petition at its close, which the standard hymn has not. In these two respects Psalm 104 resembles a prayer. However the petition is very brief, formal, almost incidental; it can scarcely be said to grow out of the psalm, and certainly the hymnal portion (verses 1-34) can not be regarded as introductory to it. Psalm 104 is also remarkable among Hebrew hymns for its length, as a hymn devoted exclusively to the activity of God in nature. Of the other nature hymns in the Psalter, Psalm 19:1-5b and Psalm 19:5c-7 are mere fragments, and Psalms 8 and 29 are relatively short, but Psalm 104 contains seventy-nine lines of which the first seventy-one are dominated by the theme:
How manifold are thy works, O Yahwe!
All of them in wisdom thou hast made.
—Verse 24.
As it stands in the text Psalm 104 has a hymnal introduction and conclusion. The brief introduction may indeed be a liturgical addition. In it the psalmist calls upon himself to praise Yahwe: “Bless my soul Yahwe.” The conclusion is longer and expresses the psalmist’s life long devotion to his God:
I will sing to Yahwe while I live;
I will sing praises to my God so long as I exist.
May my meditation be pleasing to him;
As for me I rejoice in Yahwe.