Hamzah bin Amr al-Aslami (may Allah be pleased with him) narrates: I said: "O Messenger of Allah, I am an owner of riding animals; I look after them, travel on them and hire them out. Often this month, that is Ramadan, comes upon me (while travelling), while I find strength and I am young. O Messenger of Allah, I find fasting easier for me than postponing it so that it becomes a debt upon me. So, O Messenger of Allah, should I fast, which would be greater for my reward, or should I break my fast?" He (peace and blessings be upon him) said: "O Hamzah, whichever of these you wish."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2982