Zacharias again tells us the role of the Elias priest, a role his son will fulfill. The Elias priest goes before the Lord to prepare the way, gives knowledge of (announces) salvation, which is the imminent dawn, which will give to those in the valley of the shadow of death. Finally, Elias will set the feet of those people in the path of "peace." In this description, Zacharias quotes from Worship of the Shalems texts: Isaiah 9 and Isaiah 40.
Luke, like Matthew, is a temple man and a follower of Isaiah.