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."
Muwatta Malik Book 2, Hadith 53
← Previous Hadith 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.

Muwatta Malik Book 2, Hadith 52 Next Hadith → Yahya related to me from Malik from Abu'n Nadr, the mawla of Abdullah ibn Ubaydullah, from Sulayman ibn Yasar from alMiqdad ibn al- Aswad that Ali ibn Abi Talib told him to ask the Messenger of Allah, may Allah bless him and grant him peace, what a man should do, who, when close to his wife, had a flow of prostatic fluid. Ali explained that the daughter of the Messenger of Allah, may Allah bless him and grant him peace, was living with him then and he was too shy to ask for himself. Al-Miqdad said, "I asked the Messenger of Allah, may Allah bless him and grant him peace, about it, and he said, 'When you find that, wash your genitals with water and do wudu as for prayer.' "

Muwatta Malik Book 2, Hadith 54