'Forerunner' in the Bible

and he will be His forerunner in the spirit and power of Elijah, to turn fathers' hearts to the children, and cause the rebellious to walk in the wisdom of the upright, to make a people perfectly ready for the lord."

You yourselves can bear witness to my having said, 'I am not the Christ,' but 'I am His appointed forerunner.'

where Jesus has entered as a forerunner on our behalf, having become, like Melchizedek, a High Priest for ever.