And it was narrated to us by Ahmad ibn al-Mundhir: Hammad ibn Usamah narrated to us: Abu al-ʿUmays narrated to us: Qays informed me, and he mentioned with this chain of transmission something similar, and added: Abu Usamah said: Sadaqah ibn Abi ʿImran narrated to me, from Qays ibn Muslim, from Tariq ibn Shihab, from Abu Musa — may Allah be pleased with him — who said: The people of Khaybar used to fast on the day of ʿAshura', taking it as a festival, and they would dress their women in their jewelry and finery on that day. The Messenger of Allah — peace and blessings be upon him — said: "So you fast it."