كتاب 2
2  
Book 2
(2)
Chapter 2
(2)
باب 2
Muwatta Malik 79
Yahya related to me from Malik from Nafi that Abdullah ibn Abbas used to have nose-bleeds and would leave to wash off the blood. He would then return and complete his prayer.
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عَبْدَ اللَّهِ بْنَ عَبَّاسٍ، كَانَ يَرْعُفُ فَيَخْرُجُ فَيَغْسِلُ الدَّمَ عَنْهُ ثُمَّ يَرْجِعُ فَيَبْنِي عَلَى مَا قَدْ صَلَّى ‏.‏
Reference : Muwatta Malik 79
In-book reference : Book 2, Hadith 34257
USC-MSA web (English) reference : Book 7, Hadith 79
  (deprecated numbering scheme)