Muwatta Imam Malik Book of Purity, Hadith 48

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.

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ إِذَا رَعَفَ انْصَرَفَ فَتَوَضَّأَ ثُمَّ رَجَعَ فَبَنَى وَلَمْ يَتَكَلَّمْ .