Mark 1:2 and Malachi 3:1
Mark 1:1 (NIV) The beginning of the gospel about Jesus Christ, the Son of God. 2 It is written in Isaiah the prophet: "I will send my messenger ahead of you, who will prepare your way" {[2] Mal. 3:1}
Malachi 3:1 (NIV) "See, I will send my messenger, who will prepare the way before me. Then suddenly the Lord you are seeking will come to his temple; the messenger of the covenant, whom you desire, will come," says the LORD Almighty.