Following are a number of back-translations of Luke 3:21:

• Noongar: “After John had baptised all the people in water, John also baptised Jesus. While Jesus spoke to God, Heaven opened.” (Source: Warda-Kwabba Luke-Ang)
• Uma: “Before Yohanes was imprisoned, while he was still baptizing the people, Yesus also came asking-to-be-baptized. After he was baptized, while he was praying, suddenly the sky opened,” (Source: Uma Back Translation)
• Yakan: “At the time when Yahiya bathed all the people, Isa was also bathed. When Isa had been bathed he prayed and while he was praying the sky opened” (Source: Yakan Back Translation)
• Western Bukidnon Manobo: (includes verse 22) “Now one of those days when all the people had finished being baptized, Jesus also had himself baptized by John. And then Jesus prayed, and while He was still praying, the heaven was opened and there landed on him the Holy Spirit who looked like a dove. And then God was heard speaking in Heaven, and He said, ‘You are my precious son; I am very pleased with you.’ There were very many things still that John taught those people, because he caused them to understand the good news. And as for John, he told the people that the custom of Governor Herod was bad because Herod had stolen his sister-in-law, Herodias, who was the wife of his younger brother Philip. And that which John told about was not the only evil doing of Herod because there were many other very evil things that he did. And that’s not all the evil that he did because he put John in prison.” (Source: Western Bukidnon Manobo Back Translation)
• Kankanaey: “When Juan had not yet been imprisoned when he was baptizing the many-people, Jesus also got-baptized. When that was finished and he was still praying, heaven opened” (Source: Kankanaey Back Translation)
• Tagbanwa: “When Juan had not yet been imprisoned, masses of people caused themselves to be baptized by him. Jesus also caused himself to be baptized. When Jesus was praying when coming-up-from-water, he saw that suddenly/unexpectedly the sky/heaven opened.” (Source: Tagbanwa Back Translation)