O Allah, forgive him? O Allah, take mercy on him, until he turns away, or he is defiled. He was asked: what is meant by defilement? He replied: he breaks wind gently or loudly. (Using translation from Abū Dāʾūd 471)
أَنَّ رَسُولَ اللهِ ﷺ قَالَ لَا يَزَالُ الْعَبْدُ فِي صَلَاةٍ مَا كَانَ فِي مُصَلَّاهُ يَنْتَظِرُ الصَّلَاةَ تَقُولُ الْمَلَائِكَةُ اللهُمَّ اغْفِرْ لَهُ اللهُمَّ ارْحَمْهُ حَتَّى يَنْصَرِفَ أَوْ يُحْدِثَ فَقُلْتُ مَا يُحْدِثُ؟ فَقَالَ كَذَا قُلْتُ لِأَبِي سَعِيدٍ فَقَالَ يَفْسُو أَوْ يَضْرِطُ