'Shield' in the Bible

“O mountains of Gilboa,Let not dew or rain be upon you, nor fields with offerings;For there the shield of the mighty was defiled,The shield of Saul, [dry, cracked] not anointed with oil.

My God, my rock, in whom I take refuge;My shield and the horn of my salvation, my stronghold and my refuge,My Savior—You save me from violence.

“As for God, His way is blameless and perfect;The word of the Lord is tested.He is a shield to all those who take refuge and trust in Him.

“You have also given me the shield of Your salvation,And Your help and gentleness make me great.