"Behold, My Servant, whom I uphold; My chosen one in whom My soul delights. I have put My Spirit upon Him; He will bring forth justice to the nations.” Isaiah 42:1 NASB
According to Isaiah, God the Father put His own Spirit upon the Messiah (“I have put My Spirit upon him” – Isaiah 42:1). Here we see that only One true God the Father spoke from heaven while His own omnipresent Spirit descended like a dove upon the man Christ Jesus. Thus we only see One Divine Person speaking and descending from heaven upon one human person. For God’s Divine Person (“My Soul” = One Divine Person in Isaiah 42:1) also became one human person via incarnation through the virgin (Heb. 1:3 “who is the brightness of His glory and the express image of His Person,” i.e. The Father’s Divine Person became a human person). Nothing in this text shows three coequal God Persons at Christ’s baptism as we see only “One God and one mediator between God and men, the man Christ Jesus (1 Tim. 2:5).” For the One Divine Person called the Father also became a true man person as the Son within the virgin (Matthew 1:20; Hebrews 1:5; Hebrews 2:17).