مُوَطَّأُ مَالِكٍ
Muwatta Malik 660
Fasting
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، أَنَّهُ كَانَ يُسَافِرُ فِي رَمَضَانَ وَنُسَافِرُ مَعَهُ فَيَصُومُ عُرْوَةُ وَنُفْطِرُ نَحْنُ فَلاَ يَأْمُرُنَا بِالصِّيَامِ .
Yahya related to me from Malik that Hisham ibn Urwa said, "My father, Urwa, used to travel in Ramadan, and we would travel with him, and he used to fast while we would break the fast, and he would not tell us to fast."
Arabic/English book reference: Book 18, Hadith 26