Jesus praying, the heaven was opened — It is observable, that the three voices from heaven, see Luke 9:29, Luke 9:35; John 12:28; by which the Father bore witness to Christ, were pronounced either while he was praying, or quickly after it. Matthew 3:13; Mark 1:9.
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,