Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) delivered a sermon to the people and said: "O people! Allah has made Hajj obligatory upon you." A man stood up and asked: "Is it every year?" He repeated this three times, while the Messenger of Allah (peace and blessings be upon him) kept turning away from him. Then the Prophet (peace and blessings be upon him) said: "If I had said yes, it would have become obligatory, and if it had become obligatory, you would not have been able to do it." Then he said: "Leave me as long as I leave you (do not ask me unnecessary questions). Those before you were destroyed only because of their excessive questioning of their prophets and their disagreements with them. When I command you regarding something, do it as much as you are able, and when I forbid you from something, then avoid it."