Answer:
The phrase "not messiah but is sent ahead" is often associated with John the Baptist in Christian beliefs. According to the New Testament of the Bible, John the Baptist was a prophet who came before Jesus Christ to prepare the way for his ministry. He is described as the one who would "make straight the way of the Lord" (John 1:23) and baptize people as a symbol of repentance.
John the Baptist himself explicitly stated that he was not the Messiah, but rather the one sent to announce and prepare the people for the coming of the true Messiah, who was Jesus. This is mentioned in several passages in the New Testament, including John 1:20-23.
It's worth noting that this phrase may have specific significance within Christian theology, and interpretations may vary among different religious and cultural contexts.