Musannaf Ibn Abi Shaybah

Hazrat Sufyan was asked: If a man joined the congregation with the Imam on Friday, then he had a nosebleed, and when he returned after performing ablution, the Imam had completed the prayer, but he had not spoken to anyone—what should he do? Hazrat Sufyan replied that he should pray two rak‘ahs like the Imam’s prayer. Hazrat Hasan bin Salih says that he should pray four rak‘ahs, but if he had performed one rak‘ah with the Imam, then he should pray two rak‘ahs.