After Jesus was immersed [by John], He came up out of the water and heaven was opened up before Him and He saw the Holy Spirit from God descending, as a dove, and landing upon Him.
and the Holy Spirit came down on Him in a physical form, as a dove, and a voice spoke out of heaven [saying], “You are my dearly loved Son. I am very pleased with you.”
He came to be a witness, so that he might testify concerning that Light, so that all people would believe [in Jesus] through him [i.e., through his testimony. See Acts 19:4].