A man leading people in Zuhr and Asr

Ibrahim said, concerning a man who leads people in the Zuhr prayer while for him it is the Asr prayer: "His prayer is valid, but those praying behind him are to repeat their prayer."

Abu Qilabah said: "One congregation cannot serve for two different prayers."

Abbad bin Mansur said: I came to the Jami' mosque, and I saw that the people had not yet prayed Zuhr. I began praying voluntary prayers while waiting for Zuhr, and meanwhile the congregation stood up for prayer. When they had finished the prayer, I learned that it had been the Asr prayer. So I then performed my Zuhr prayer, and then prayed Asr. Then I came to al-Hasan and asked him about this issue, and he instructed me to do just what I had done.

Kathir bin Aflah said: I reached the mosque and had not yet prayed Maghrib. Meanwhile the congregation stood up, and I prayed with them, thinking it was the Maghrib prayer, but I found out that they were praying Isha. So I first prayed Maghrib and then Isha. Then I asked the elders about this, and they instructed me to do just what I had done.

Al-Zuhri said, concerning a person who joins a congregation thinking it is the Zuhr prayer while they are praying Asr: "He should first pray the prayer that Allah placed first, that is, Zuhr, and then pray Asr."

Tawus and Ata said: "In this way too his prayer is valid."

Jabir said: I asked Abu Ja'far, Salim, al-Qasim and Ata about a person who joins a congregation thinking it is the Zuhr prayer while they are praying Asr. They said: "After finishing he should pray Zuhr, and his Asr prayer is valid." He said: I asked Amir and Muslim bin Subayh about this, and they said: "When he has finished he should first pray Zuhr and then Asr, because Allah Almighty has ordained Zuhr before Asr; so that prayer does not count for him as Zuhr."

Jabir reported something similar from Hammad, from Ibrahim.

Sa'id bin al-Musayyib and al-Hasan said, regarding a man who joins a congregation thinking it is the Zuhr prayer while the people are praying Asr: he must perform both prayers again.