Vicarious Sacrifice: Jesus Uses the I am Clause to Describe Himself as the Good Shepherd: Unobjectionable, Blameless, Excellent; Also Called the Great Shepherd, Heb 13:2021 cf. Eph 1:34 & Chief Shepherd, 1 Pet 5:4; He Will Lay Down His Life for the Sheep: Contract of Suretyship Defined