The Messenger of Allah ﷺ said: When any of you breaks wind during the prayer, he should turn away and perform ablution and repeat the prayer.  

قَالَ رَسُولُ اللَّهِ ﷺ إِذَا فَسَا أَحَدُكُمْ فِي الصَّلاَةِ فَلْيَنْصَرِفْ فَلْيَتَوَضَّأْ وَلْيُعِدِ الصَّلاَةَ