Nafi' (may Allah have mercy on him) narrates that when Abdullah bin Umar (may Allah be pleased with them both) would have a nosebleed, he would leave the prayer, perform ablution, and return without speaking.
Hadith Referenceمسند الإمام الشافعي / كتاب الطهارة / 63
Hadith Takhrijأخرجه مالك في الموطأ، الطهارة، باب ما جاء في الرعاف.