Isaiah 50:5

The Servant claimed to have always responded obediently to whatever God had spoken (cf. John 8:29). Clearly, the Servant could not be Israel or any mere human person or group of people. Opening the ear is something that God had done for Him; He had given the Servant the ability and the desire to hear and respond obediently to the Word of God. On the other hand, the Servant had not turned back from it once He had heard it (cf. Exodus 4:13; Jonah 1:3; Jeremiah 20:9; Jeremiah 20:14).