John signals Jesus as the messiah. John 3:22-30

22After this Jesus and his disciples went into the land of Judea; there he remained with them and baptized. 23John also was baptizing at Ae'non near Salim, because there was much water there; and people came and were baptized. 24For John had not yet been put in prison. 25Now a discussion arose between John's disciples and a Jew over purifying. 26And they came to John, and said to him, "Rabbi, he who was with you beyond the Jordan, to whom you bore witness, here he is, baptizing, and all are going to him." 27John answered, "No one can receive anything except what is given him from heaven. 28You yourselves bear me witness, that I said, I am not the Christ, but I have been sent before him. 29He who has the bride is the bridegroom; the friend of the bridegroom, who stands and hears him, rejoices greatly at the bridegroom's voice; therefore this joy of mine is now full. 30He must increase, but I must decrease."