Luke 1:16-17, 76

And many of the children of Israel shall he turn unto the Lord their God. And he shall go before his face in the spirit and power of Elijah, to turn the hearts of the fathers to the children, and the disobedient to walk in the wisdom of the just; to make ready for the Lord a people prepared for him.

Yea and thou, child, shalt be called the prophet of the Most High: For thou shalt go before the face of the Lord to make ready his ways