Sunan an-Nasa'i

It was narrated from Hani bin Ash-Shikhkhir, from a man from Balharish, that his father said: "I was traveling and I came to the Prophet when I was fasting, and he was eating. He said: “Come (and eat).' I said: “I am fasting.' He said: “Come here; do you not know what Allah has waived for the traveler?' I said: “What has Allah waived for the traveler?' He said: “Fasting and half of the prayer”””””"