5. opened … ear—(See on Isa 42:20; Isa 48:8); that is, hath made me obediently attentive (but Maurer, "hath informed me of my duty"), as a servant to his master (compare Ps 40:6-8, with Php 2:7; Isa 42:1; 49:3, 6; 52:13; 53:11; Mt 20:28; Lu 22:27).
not rebellious—but, on the contrary, most willing to do the Father's will in proclaiming and procuring salvation for man, at the cost of His own sufferings (Heb 10:5-10).