Angels of God hovered over the scene of His baptism; the Holy Spirit descended in the form of a dove and lighted upon Him, and as the people stood greatly amazed, with their eyes fastened upon Him, the Father's voice was heard from heaven, saying, Thou art My beloved Son; in Thee I am well pleased. SR 196.3
John was not certain that it was the Saviour who came to be baptized of him in Jordan. But God had promised him a sign by which he should know the Lamb of God. That sign was given as the heavenly dove rested upon Jesus and the glory of God shone round about Him. John reached forth his hand, pointing to Jesus, and with a loud voice cried out, “Behold the Lamb of God, which taketh away the sin of the world!” John 1:29. SR 196.4