Amr bin Aws bin Abi Aws عمرو بن أوس بن أبي أوس · Fasting (Kitab Al-Siyam)

AbdurRahman reported on the authority of his uncle that the people of the tribe Aslam came to the Prophet (ﷺ). He said (to them): Did you fast on this day? They replied: No. He said: Complete the rest of your day, and make atonement for it.