He was the one Isaiah spoke about when he said, “A voice is heard crying out in the desert, ‘Prepare the way of the Lord. Make the paths straight for him.’”
Look! I am sending my messenger, and he will prepare the way for me. The Lord you are seeking will suddenly arrive at his Temple. The messenger of the agreement you say is so happy with you is coming, says the Lord Almighty.
He will go ahead of the Lord in the spirit and power of Elijah, to turn the fathers back to thinking about their children, and to turn those who are rebellious back to a right understanding—to prepare a people ready for the Lord.”