Musannaf Ibn Abi Shaybah 38888 — The man marrying again after lian

Sayyidah Aishah (may Allah be pleased with her) said: the Prophet (peace and blessings be upon him) had an illness, and some people from among the Companions came to visit him. He (peace and blessings be upon him) prayed sitting while those people prayed behind him (peace and blessings be upon him) standing. So he (peace and blessings be upon him) gestured to them to sit, and they sat. Then when he (peace and blessings be upon him) had finished the prayer, he said: "The imam is appointed only to be followed. So when he bows, bow as well; when he raises his head, raise your heads as well; and when he prays sitting, pray sitting as well."