Musannaf Ibn Abi Shaybah

Hazrat Abu Huraira narrates that the Holy Prophet (peace and blessings be upon him) was on a journey, and Hazrat Abu Bakr and Hazrat Umar were also with him. Food was brought to the Prophet, so he said to both of them, "Come and eat." Both of them said, "We are fasting." The Holy Prophet (peace and blessings be upon him) said, "Prepare the saddle for your two companions, do work for your two companions, come close and eat food."