Musannaf Ibn Abi Shayba 3:2018

Waki’ narrated to us, from Abu Khuldah, who said: I said to Abu al-‘Aliyah, "I prayed in the mosque of the Banu so-and-so, and their Imam recited [Surat] al-Sajdah but did not prostrate." He said, "Why did you not prostrate?"