Musannaf Ibn Abi Shayba 3:3537

Hushaym narrated to us, he said: 'Abd al-Hamid al-Bahiy informed us, from Yazid ibn 'Abd Allah ibn Qusayt, who said: I saw Sa'id ibn al-Musayyib have a nosebleed while he was in his prayer. So he went to the house of Umm Salamah, the wife of the Prophet, may Allah bless him and grant him peace, and he performed ablution without speaking, and he continued his prayer from where he had left off.