HAJJ: Fifth Pillar of Islam
HAJJ - The Obligation, Mankind owes To ALLAH
"Therein are clear Memorials:
(The first is) the Place where Abraham stood for prayers (- Maqam Ibrahim);
(secondly,) whosoever enters it (- the valley of Bakkah) is in a state of peace and security; (thirdly,) Pilgrimage to the House (- Ka`bah) is due to Allah from everyone of mankind who is (physically, financially and in many other ways) able and has the means to make the journey thereto. And whosoever disobeys (let him remember that) Allah is Independent of the worlds."
[3:97 - Amatul Rahman Omar]