(1) The fifth pillar of Islam is a pilgrimage to Mecca during the month of Dhu al-Qadah; at least once in a lifetime a Muslim is expected to make a religious journey to Mecca and the Kaaba
"For a Muslim the hajj is the ultimate act of worship"
Arabic < (ħajja, to overcome).
1855: The word Hajj is explained by Moslem divines to mean “Kasd,” or aspiration, and to express man’s sentiment that he is but a wayfarer on earth wending towards another and a nobler world. — Sir Richard Francis Burton, Personal Narrative of a Pilgrimage to Al-Madinah & Meccah, 1855, Appendix I.