Abu Bakr ibn Abi Shaybah narrated to us, Muhammad ibn Bishr al-‘Abdi narrated to us, ‘Ubaydullah ibn ‘Umar narrated to us, from Abu al-Zinad, from al-A‘raj, from Abu Hurayrah, may Allah be pleased with him, who said: The Messenger of Allah, peace and blessings be upon him, mentioned the crescent moon and said: "When you see it, fast, and when you see it, break your fast. And if it is obscured from you, then count thirty [days]."