Hajj is Obligatory Only Once in Life
Narrated by Abu Hurairah(Radhiallah o anho):
once, in a sermon, Allah’s Messenger (sallallaahu ‘alaihi wasallam) said: “O people! Allah has prescribed Hajj for you, so you must perform it.” A man asked: “Every year, O Prophet of Allah?” The Prophet (peace be upon him) remained silent. When the man repeated it thrice, the Prophet (peace be upon him) said: “Had I said ‘yes’, it would have become a yearly obligation, and this would have been beyond your power.” Then he added: “Leave me alone so long as I leave you alone (i.e., do not pester me with questions about things which I omit and do not mention). Some people who lived before you were destroyed because they asked too many questions and disagreed with their Prophets. So when I command you to do something, you must obey and do it to the best of your power, and if I forbid you from something, then avoid it.” (Bukhari and Muslim)
Hajj – Allah sets free more servants from Hell on the Day of Arafah
Narrated by Aisha(Radhiallaho anha):
Allah’s Messenger (sallallaahu ‘alaihi wasallam) said, There is no day when God sets free more servants from Hell than the Day of Arafah. He draws near, then praises them to the angels, saying: What do these want?
Sahih Muslim No.650