مُوَطَّأُ مَالِكٍ
Muwatta Malik 78
Purity
حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ إِذَا رَعَفَ انْصَرَفَ فَتَوَضَّأَ ثُمَّ رَجَعَ فَبَنَى وَلَمْ يَتَكَلَّمْ .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar would leave and do wudu if he had a nose-bleed and then return and complete his prayer without saying anything.
Arabic/English book reference: Book 2, Hadith 48