In Psalm 118:14, the same psalmist declares 'The Lord is my strength and my song' — the identical praise for God's salvation found here.

Psalm 118:20 identifies the gate as the Lord's, where the righteous enter — the context for the thanksgiving in verse 21.

Psalm 22:24 affirms God heard the afflicted, directly reinforcing the answered prayer in Psalm 118:21.

Psalm 69:33 states the LORD hears the needy, echoing the theme of answered prayer in Psalm 118:21.

Exodus 15:2 is the original source of the phrase 'my strength and my song' — Moses' song after crossing the Red Sea, echoed here.

Isaiah 12:2 repeats the same Exodus 15:2 phrase, showing this salvation song became a standard confession of trust in God.