Luke 3:18
So, John preached the good news to the people with many different appeals.
John 1:15
John gave testimony about Jesus, shouting out, "This person is the one about whom I said, 'He who will come after me ranks above me because He existed before me.'"
John 1:29
On the next day John [the Immerser] saw Jesus approaching him and said, "Look, [there is] the Lamb of God; He [will] take away the sin of the people of the world.
John 1:34
And I have seen and given testimony that this person is the Son of God."
John 3:29-36
The one who has the bride is the groom; but the best man, who stands up with him and listens to him [take his vows], is very happy when he hears him speak. So, [now] my joy is complete [i.e. over hearing about Jesus' ministry].
Acts 2:40
So, Peter testified and urged the crowd with many additional words, saying, "Save yourselves from [the condemnation coming on] this sinful generation [by responding to this message]."