(55) باب ذِكْرِ الاِخْتِلاَفِ عَلَى مَنْصُورٍ
It was narrated that Al-'Awwam bin Hawshab said:
"I said to Mujahid: 'What about fasting while traveling?' He said: 'The Messenger of Allah used to fast (sometimes) and not fast (sometimes)."'
Reference: Sunan an-Nasa'i 2292
In-book reference: Book 22, Hadith 203
English translation: Vol. 3, Book 22, Hadith 2294