Ver. 21,22. This history of our Saviour's baptism is reported both by Matthew and Mark, much most largely by Matthew; See Poole on "Matthew 3:13"., &c. Luke only addeth those words, and praying, which teacheth us that prayers ought to be joined with baptism. What was the matter of his prayer we are not told, though the following words incline some not improbably to judge that he prayed for some testimony from heaven concerning him.
Related Commentaries of Luke 3:21
Luke 3:21
21 Now when all the people were baptized, it came to pass, that Jesus also being baptized, and praying, the heaven was opened,