Now when all the people were baptized, it came to pass, that Jesus also being baptized, and praying, the heaven was opened, Jesus - being baptized - See on Matthew 3:16, Matthew 3:17 (note).
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,