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In page Anointing:

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The expression "anoint the shield" which occurs in Isaiah[20] is a related or poetic usage, referring to the practice of rubbing oil on the leather of the shield to keep it supple and fit for war.[5] The practice of anointing a shield predates the anointing of other objects in that the "smearing" (Hebrew "mashiach") of the shield renewed the leather covering on a wooden shield. A victorious soldier was elevated on his shield by his comrades after a battle or upon his selection as a new king. The idea of protection and selection arose from this and was extended to the idea of a "chosen one" thus leading to the modern concept of a Messiah (Hebrew for the one who was anointed.)[citation needed]