Hadith 109
قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ : " لا تُقْبَلُ صَلاةُ أَحَدِكُمْ إِذَا أَحْدَثَ حَتَّى يَتَوَضَّأَ "
And the Messenger of Allah, peace and blessings be upon him, said: "When any one of you becomes without ablution, his prayer is not accepted until he performs ablution."