Now it happened, when all the people were baptized, Jesus also had been baptized, and was praying. The sky was opened,
Holy Spirit descended in a bodily form, as a dove ... This was the heavenly portent by which John the Baptist recognized the Messiah (John 1:33).  Appropriately, the dove was a clean creature under the Mosaic law, acceptable in the holy sacrifices as an offering to God, an emblem in all ages of peace, gentleness, and innocence, a monogamous creature, possessing no gall, and used as a messenger.[12]