It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) set out from Madinah Munawwarah with the intention of Makkah Mukarramah. He was fasting, but when he reached the place of Usfan, he had a vessel brought and placed it on his hand so that everyone could see, and then he broke his fast. Therefore, Sayyiduna Ibn Abbas (may Allah be pleased with them both) used to say that a traveler has permission whether he fasts or not (he can make it up later).