Psalm 145:5 describes speaking of God's splendor and meditating on works, providing specific content for the praise declared in 145:21.

Psalm 145:2 continues the daily praise theme, reinforcing 145:21's vow to speak praise and call others to praise.

Psalm 145:1 begins the psalm with the same commitment to praise, echoing the call for all creatures to praise in 145:21.

Psalm 67:3 calls all peoples to praise God — directly matching the call for all flesh to bless His name.

Psalm 150:6 calls everything that breathes to praise—the ultimate fulfillment of 'let all flesh bless' here.

Psalm 117:1 summons all nations and peoples to praise the Lord — a direct universal praise command matching 'all flesh'.

Psalm 103:22 calls all God's works in all places to bless the Lord — broadening the call to all creation.

Psalm 89:1 declares singing of God's love forever and making known His faithfulness with the mouth — a very close parallel.

Psalm 86:9 says all nations will come and worship, glorifying God's name — a clear parallel to all flesh blessing Him.

In Psalm 71:8, the psalmist also declares his mouth is filled with God's praise — echoing the same commitment to verbal praise.

Psalm 30:12 promises to sing God's praises forever, directly paralleling 145:21's determination to praise and call all creatures to praise.

Psalm 115:18 vows to bless God forever—the same eternal praise all flesh is summoned to here.

Psalm 71:15 has the mouth telling of God's righteous acts and salvation — a specific extension of the general praise theme.

Psalm 71:24 mentions the tongue talking of God's help all day — similar verbal praise but with a deliverance context.

Psalm 71:23 adds lips shouting for joy in praise and singing, linking vocal praise with redemption.

Psalm 67:4 has nations being glad and singing for joy because of God's judgment — a related but more specific praise theme.

Revelation 5:11-14 shows every creature in heaven and earth blessing God—the cosmic worship predicted here.

James 3:9 warns against blessing God while cursing people—applying the pure praise commanded here to daily speech.