Psalm 103: "1 Bless the LORD, O my soul, and all that is within me, bless his holy name! 2 Bless the LORD, O my soul, and forget not all his benefits, 3 who forgives all your iniquity, who heals all your diseases, 4 who redeems your life from the pit, who crowns you with steadfast love and mercy, 5 who satisfies you with good so that your youth is renewed like the eagle's.
"6 The LORD works righteousness and justice for all who are oppressed. 7 He made known his ways to Moses, his acts to the people of Israel. 8 The LORD is merciful and gracious, slow to anger and abounding in steadfast love. 9 He will not always chide, nor will he keep his anger forever. 10 He does not deal with us according to our sins, nor repay us according to our iniquities. 11 For as high as the heavens are above the earth, so great is his steadfast love toward those who fear him; 12 as far as the east is from the west, so far does he remove our transgressions from us. 13 As a father shows compassion to his children, so the LORD shows compassion to those who fear him. 14 For he knows our frame; he remembers that we are dust. 15 As for man, his days are like grass; he flourishes like a flower of the field; 16 for the wind passes over it, and it is gone, and its place knows it no more. 17 But the steadfast love of the LORD is from everlasting to everlasting on those who fear him, and his righteousness to children's children, 18 to those who keep his covenant and remember to do his commandments. 19 The LORD has established his throne in the heavens, and his kingdom rules over all.
"20 Bless the LORD, O you his angels, you mighty ones who do his word, obeying the voice of his word! 21 Bless the LORD, all his hosts, his ministers, who do his will! 22 Bless the LORD, all his works, in all places of his dominion. Bless the LORD, O my soul!"
John 1:1-4: "1 In the beginning was the Word, and the Word was with God, and the Word was God. 2 He was in the beginning with God. 3 All things were made through him, and without him was not any thing made that was made. 4 In him was life, and the life was the light of men."
John 1:14: "14 And the Word became flesh and dwelt among us, and we have seen his glory, glory as of the only Son from the Father, full of grace and truth."
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The text is public domain:
1 O bless the Lord, my soul!Let all within me joinAnd aid my tongue to bless His nameWhose favors are divine.2 O bless the Lord, my soul,Nor let His mercies lieForgotten in unthankfulnessAnd without praises die!3 'Tis He forgives thy sins;'Tis He relieves thy pain;'Tis He that heals thy sicknessesAnd makes thee young again.4 He crowns thy life with loveWhen ransomed from the grave;He that redeemed my soul from hellHath sov'reign pow'r to save.5 He fills the poor with good;He gives the suff'rers rest.The Lord hath judgements for the proudAnd justice for th'oppressed.6 His wondrous works and waysHe made by Moses known,But sent the world His truth and graceBy His belovèd Son.
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The hymn text paraphrases the first seven verses from Psalm 103. The first four verses of the hymn correspond to the first four verses of the Psalm; the hymn's fifth verse comes from verses 5-6 of the Psalm; and the first half of the hymn's sixth verse comes from verse 7.
The two passages from John 1 (but mostly just verse 14) appear in the lines "But sent the world His truth and grace / By His belovèd Son" at the end of the sixth verse.
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The line "He fills the poor with good" at the beginning of the fifth verse echoes "he has filled the hungry with good things" in the Magnificat (Luke 1:53).