Messenger of Allah ﷺ said, "The angels keep on asking Allah's forgiveness for anyone of you, as long as he is at his Musalla (praying place) and he does not pass wind (Hadath). They say, 'O Allah! Forgive him, O Allah! be Merciful to him." (Using translation from Bukhārī 445)
"إِنَّ الْمَلَائكَةَ تُصَلِّى عَلىَ أَحَدِكُم مَا دَام في مُصَلَّاهُ الَّذِى صَلَّى فيه، مَا لَمْ يُحْدِثْ : الَّلهُمَّ اغْفِر لَهُ الَّلهُم ارْحَمْهُ".