'Shield' in the Bible

O mountains of Gilboa, [let there be] no dew or rain upon you or on the fields of [grain for] offerings, for there the small shield of [the] mighty [was] defiled, the small shield of Saul [was] not anointed with oil.

I take refuge in God, my rock, my shield, and the {strength} of my salvation. My stronghold and my refuge, O my savior, you will save me from violence!

This God, his way [is] blameless; the promise of Yahweh [is] flawless. He [is] a shield to all who take refuge in him.

You have given me the shield of your salvation; your willingness to help has made me great.