The Prophet (may Allah's peace and blessings be upon him) was keen on maintaining good relations, harmony, and continuous cordiality among the Muslims. Hence, he made the acceptance of an invitation a due right among the Muslims, so that they stay connected and get together. In this Hadīth, the Prophet (may Allah's peace and blessings be upon him) says: "If one of you is invited to food," i.e., any food, be it a banquet or something else, "while he is fasting" on a supererogatory basis, or making up for a missed fast, or in fulfillment of a vow, he should apologize. Specifically, the Prophet (may Allah's peace and blessings be upon him) directed the fasting person to clarify his condition: "let him say: 'I am fasting'" in an apology to the inviting person and to inform him that he is fasting and cannot eat from his food. This is also meant to notify his fellow Muslim who invited him that his abstention is only because of fasting, not that he did not want to eat from his food. It was the habit of the Arabs that if they held evil intentions toward someone, they would not eat from his food. It is narrated in the Sahīh Muslim Collection that Abu Hurayrah (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) said: "If one of you is invited, let him answer the invitation. If he is fasting, let him supplicate (for the inviter); if he is not fasting, let him eat." In the Hadīth: There is nothing wrong with revealing voluntary acts of worship - like prayer and fasting - if there is a need for that..