Psalm 57:7-11 is the direct source: 'My heart is steadfast... I will sing and make melody' is quoted verbatim in Psalm 108:1.

Psalm 57:8 is the direct continuation of the same hymn, calling for musical instruments to awake.

Psalm 105:1-5 calls to sing praises and tell of God's wondrous works—parallel to the personal declaration of singing in Psalm 108:1.

Psalm 30:12 says 'my glory may sing your praise' using the same phrase 'my glory' as in Psalm 108:1 (from Ps 57:8). Both express personal praise.

Psalm 71:8 says 'my mouth is filled with your praise all the day' — a parallel commitment to continuous praise, though focused on mouth rather than heart.

Psalm 71:15 expands on the content of praise — telling of God's righteous acts and salvation all day long.

Psalm 71:23 echoes the same theme of singing with joy, adding that the soul has been redeemed.

Psalm 109:30 shows the same intention to praise with the mouth, now in the midst of the congregation.

Psalm 145:21 broadens the praise to all flesh blessing God's holy name forever.

Psalm 71:24 continues the theme of declaring God's righteous help, with added vindication over enemies.

James 3:9 contrasts the pure praise of a steadfast heart with the tongue's inconsistency in blessing and cursing.