In Genesis 15:1, God is Abram's shield — the same metaphor David uses for the shield of salvation here.

Psalm 18:35 is the parallel passage — almost identical wording, confirming David's song of deliverance.

Psalm 84:11 calls God a sun and shield who bestows favor — echoing David's recognition of God as his shield.

Ephesians 6:16 uses the shield of faith — a spiritual development of the 'shield of salvation' imagery here.