Mu'awiya ibn Abu Sufyan · The Book of Fasting

"The Messenger of Allah said: 'The month is twenty-nine days."'

"I came to the Messenger of Allah from a journey and he said: 'Stay and have a meal to break the fast, O Abu Umayyah.' I said: 'I am fasting.' He said: 'Come close to me and I will tell you about the traveler. Allah, the mighty and sublime, has waived fasting and half of the prayer for him."'