You yourselves are my witnesses [you personally bear me out] that I stated, I am not the Christ (the Anointed One, the Messiah), but I have [only] been sent before Him [in advance of Him, to be His appointed forerunner, His messenger, His announcer]. [Mal. 3:1.]
And Paul said, John baptized with the baptism of repentance, continually telling the people that they should believe in the One Who was to come after him, that is, in Jesus [having a conviction full of joyful trust that He is Christ, the Messiah, and being obedient to Him].