'Forerunner' in the Bible

It is he who will go as a forerunner before Him in the spirit and power of Elijah, to turn the hearts of the fathers back to the children, and the disobedient to the attitude of the righteous, so as to make ready a people prepared for the Lord.”

where Jesus has entered as a forerunner for us, having become a high priest forever according to the order of Melchizedek.