Musannaf Ibn Abi Shaybah 6831 — Repeating the prayer

Abu Ishaq said: I prayed Asr with my family. Then I went out with Ibn al-Aswad, and we passed by a mosque where the prayer was being held. He said: "Come, let us go into this mosque and pray." I said: "I have already prayed." He said: "Even if you have prayed, pray again."