(46) باب مَا يُكْرَهُ مِنَ الصِّيَامِ فِي السَّفَرِ
It was narrated that Kab bin 'Asim said:
"I heard the Messenger of Allah say; 'It is not righteousness to fast when traveling."'
Reference: Sunan an-Nasa'i 2255
In-book reference: Book 22, Hadith 166
English translation: Vol. 3, Book 22, Hadith 2257