Muwatta Imam Malik Book of Purity, Hadith 8

Yahya said that Malik was asked about what a man should do if he had forgotten to rinse his mouth and nose until he had prayed, and he said, "He does not have to repeat the prayer, but should rinse his mouth and nose if he wishes to do any more prayers after that."

قَالَ يَحْيَى وَسُئِلَ مَالِكٌ عَنْ رَجُلٍ نَسِيَ أَنْ يَتَمَضْمَضَ وَيَسْتَنْثِرَ حَتَّى صَلَّى قَالَ لَيْسَ عَلَيْهِ أَنْ يُعِيدَ صَلاَتَهُ وَلْيُمَضْمِضْ وَيَسْتَنْثِرْ مَا يَسْتَقْبِلُ إِنْ كَانَ يُرِيدُ أَنْ يُصَلِّيَ .