'Shield' in the Bible

Ye mountains of Gilboa, let there be no dew, no rain upon you, nor fields of heave-offerings! For there the shield of the mighty was vilely cast away, The shield of Saul, as not anointed with oil.

God is my rock, in him will I trust My shield, and the horn of my salvation, My high tower, and my refuge, My saviour: thou wilt save me from violence.

As for God, his way is perfect; The word of Jehovah is tried: He is a shield to all that trust in him.

And thou didst give me the shield of thy salvation, And thy condescending gentleness hath made me great.