Matthew 3:14

14. John forbade him This clearly implies that though John was unacquainted with his person, yet the spirit of discerning within recognized the divine in Christ. So confident is John of this, that though he knows him not, he addresses Jesus as his own superior. He only needs to behold the sign that God has appointed, and then he will proclaim him to the world openly. Before that token is given John does not dare to preach him to men. In this way it will be seen that there is no contradiction, as some have supposed, with John 1:31.

I have need to be baptized of thee John has objections. But what objections! They are deep, gentle humility itself. The rough voice of the rebuker melts down to tenderness when he sees the great, gentle One coming. I am a sinner, thou art the sinless One; I am the sent messenger, thou art the coming Jehovah-Messiah. And comest thou to me for baptism? O baptize my body and soul with thy blessed spirit.