Musannaf Ibn Abi Shayba 3:2374

Abu Bakr narrated to us, he said: Abd al-Wahhab al-Thaqafi narrated to us, from Ayyub, from Muhammad ibn Sirin, from some of the sons of Abu Bakrah, that Abu Bakrah slept in a *daliyah* (a water-drawing structure) of theirs. We thought that he had prayed the Asr prayer, but he woke up at the setting of the sun. He said: So he waited until the sun had set, then he prayed.