(46) باب مَا يُكْرَهُ مِنَ الصِّيَامِ فِي السَّفَرِ
It was narrated that Saeed bin Al-Musayyab said:
"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.
Reference: Sunan an-Nasa'i 2256
In-book reference: Book 22, Hadith 167
English translation: Vol. 3, Book 22, Hadith 2258