(58) باب ذِكْرِ الاِخْتِلاَفِ عَلَى هِشَامِ بْنِ عُرْوَةَ فِيهِ
It was narrated that 'Aishah said:
"Hamzah said to the Messenger of Allah: 'O Messenger of Allah, should I fast while traveling?' He used to fast a great deal. The Messenger of Allah said to him: "If you wish then fast and if you wish then do not fast."'
Reference: Sunan an-Nasa'i 2306
In-book reference: Book 22, Hadith 217
English translation: Vol. 3, Book 22, Hadith 2308