A question on prayer

Sufyan was asked about a man who was resident (not travelling) when the sun passed its zenith, and then he set out on a journey: how should he pray? He said: If he prays within the time of Zuhr, he prays two rak'ahs.

Al-Hasan bin Salih said: When the sun has passed its zenith for him here (at home), he prays four rak'ahs on the journey.

He said: Sufyan said, regarding a traveller who joined a resident (imam) in prayer and prayed one rak'ah with him, then saw something and spoke, and meanwhile the imam completed the prayer: The traveller repeats two rak'ahs, and so returns to the original (ruling) he was on.

Al-Hasan bin Salih said: He prays four rak'ahs, because he has made them binding upon himself.

Sufyan was asked about a man who joined the imam in the congregation on Friday, then his nose began to bleed; he went and performed ablution, and when he came back the imam had finished the prayer, but the man had not spoken to anyone: what should he do? Sufyan said: He prays two rak'ahs, like the imam's prayer.

Al-Hasan bin Salih said: He prays four rak'ahs, unless he had already prayed one rak'ah with him (the imam).