Yahya related to me from Hisham ibn Urwa from his father that al- Miswar ibn Makhrama told him that he had visited Umar ibn al Khattab on the night he was stabbed and had woken him up for the subh prayer and Umar had said, ''Yes. Whoever stops doing the prayer will get nothing from Islam," and he did the prayer with blood pouring from his wound.  

أَخْبَرَهُ أَنَّهُ دَخَلَ عَلَى عُمَرَ بْنِ الْخَطَّابِ مِنَ اللَّيْلَةِ الَّتِي طُعِنَ فِيهَا فَأَيْقَظَ عُمَرَ لِصَلاَةِ الصُّبْحِ فَقَالَ عُمَرُ نَعَمْ وَلاَ حَظَّ فِي الإِسْلاَمِ لِمَنْ تَرَكَ الصَّلاَةَ فَصَلَّى عُمَرُ وَجُرْحُهُ يَثْعَبُ دَمًا  

Yahya related to me from Malik from Yahya ibn Said that Said ibn al-Musayyab was asked, "What do you say about someone who is afflicted by a nose-bleed which does not stop? "Malik said that Yahya ibn Said said that Said ibn al Musayyab said, "I say that he should signal with his head." (i.e. instead of doing sajda or ruku.) Yahya said that Malik said, "That is what I like most out of what I have heard about the matter."  

قَالَ مَا تَرَوْنَ فِيمَنْ غَلَبَهُ الدَّمُ مِنْ رُعَافٍ فَلَمْ يَنْقَطِعْ عَنْهُ قَالَ مَالِكٌ قَالَ يَحْيَى بْنُ سَعِيدٍ ثُمَّ قَالَ سَعِيدُ بْنُ الْمُسَيَّبِ أَرَى أَنْ يُومِئَ بِرَأْسِهِ إِيمَاءً قَالَ يَحْيَى قَالَ مَالِكٌ وَذَلِكَ أَحَبُّ مَا سَمِعْتُ إِلَىَّ فِي ذَلِكَ