The Prophet ﷺ said, "Allah does not accept prayer of anyone of you if he does Hadath (passes wind) till he performs the ablution (anew).  

عَنِ النَّبِيِّ ﷺ قَالَ لاَ يَقْبَلُ اللَّهُ صَلاَةَ أَحَدِكُمْ إِذَا أَحْدَثَ حَتَّى يَتَوَضَّأَ