("Person for person".) (Genesis 43:9). The hand was given in token of undertaking the office or becoming responsible for a debt (Job 17:13; Proverbs 6:1; Psalms 119:122; Isaiah 38:14): "undertake (harbeeni ) for me," Hebrew "be surety for me." Christ is the "surety (enguos ) of a better testament" (Hebrews 7:22; Hebrews 9:11-15); Jeremiah 30:21, "who is this that engaged his heart to approach unto Me?" literally, pledged his life, a thing unique: Messiah alone made His life responsible for ours. "Heart" implies the courage it needed to undertake such a tremendous suretiship; the question implies admiration at His union of Godhead and manhood qualifying Him for the work.