It is narrated from Hazrat Abu Saeed Khudri (may Allah be pleased with him) that we set out with the Prophet (peace and blessings be upon him) for the Battle of Hunain on the seventeenth or eighteenth of Ramadan. Some of us would fast and some would not, but neither the one who fasted found fault with the one who did not, nor did the one who did not fast find fault with the one who did. (This means that whoever had the strength to fast would do so, and whoever did not have the strength would leave it and make it up later.)