For this is he who was spoken of by Isaiah the prophet, saying, “The voice of one crying in the wilderness, make the way of the Lord ready! Make his paths straight!”
“Behold, I send my messenger, and he will prepare the way before me! The Lord, whom you seek, will suddenly come to his temple. Behold, the messenger of the covenant, whom you desire, is coming!” says the LORD of Hosts.
He will go before him in the spirit and power of Elijah, ‘to turn the hearts of the fathers to the children,’ and the disobedient to the wisdom of the just; to prepare a people prepared for the Lord.”