Sayyiduna Abu Umayyah al-Damri (may Allah be pleased with him) said: I came back from a journey to the Prophet (peace and blessings be upon him) and greeted him (peace and blessings be upon him) with salam. When I was about to leave, he (peace and blessings be upon him) said: "O Abu Umayyah! Wait for the meal." I said: O Prophet of Allah! I am fasting. He (peace and blessings be upon him) said: "I will tell you about the traveller: Allah has relieved him of fasting and half of the prayer."
Hadith Referenceالمعجم الكبير للطبراني / مسند من يعرف بالكنى / 19110