Ali bin al-Mubark al-Hna'iy علي بن المبارك الهنائي · The Book of Fasting

"Jibril, peace be upon him, came to me and said: 'The month is twenty-nine days."'

"I heard the Messenger of Allah say; 'It is not righteousness to fast when traveling."'

"The Messenger of Allah said: 'It is not righteousness to fast when traveling."' (Sahih) Abu 'Abdur-Rahman (An-Nasai) said: This is a mistake, and what is correct is the one that is before it. We do not know of anyone who followed up Ibn Kathir.