This is the one of whom the prophet Isaiah spoke when he said, “The voice of one crying out in the wilderness: ‘Prepare the way of the Lord; make his paths straight.’ ”
See, I am sending my messenger to prepare the way before me, and the Lord whom you seek will suddenly come to his temple. The messenger of the covenant in whom you delight—indeed, he is coming, says the Lord of hosts.
With the spirit and power of Elijah he will go before him, to turn the hearts of parents to their children and the disobedient to the wisdom of the righteous, to make ready a people prepared for the Lord.”