John 4:2 (although Jesus Himself was not baptizing, but His disciples were),

Acts 10:48 And he ordered them to be baptized in the name of Jesus Christ. Then they asked him to stay on for a few days.

1 Corinthians 2:1 And when I came to you, brethren, I did not come with superiority of speech or of wisdom, proclaiming to you the testimony of God.

1 Corinthians 2:4 and my message and my preaching were not in persuasive words of wisdom, but in demonstration of the Spirit and of power,

2 Corinthians 10:10 For they say, "His letters are weighty and strong, but his personal presence is unimpressive and his speech contemptible."

2 Corinthians 11:6 But even if I am unskilled in speech, yet I am not so in knowledge; in fact, in every way we have made this evident to you in all things. (NASB ©1995)