Mishkat al-Masabih 7 Fasting كتاب الصوم 69

وَعَنْ سَلَمَةَ بْنِ الْمُحَبَّقِ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ كَانَ لَهُ حَمُولَةٌ تَأْوِي إِلَى شِبْعٍ فَلْيَصُمْ رَمَضَانَ من حَيْثُ أدْركهُ» . رَوَاهُ أَبُو دَاوُد

Salama b. al-Muhabbiq reported God’s messenger as saying, “If anyone has a riding-beast which carries him to where he can get sufficient food he should observe the fast of Ramadan wherever he is when it comes.” Abu Dawud transmitted it.