The fifth pillar of Islam is a pilgrimage to Mecca during the month of Dhu al-Hijja; 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.

synonyms: hadj, hajj.

Dutch: hadj, bedevaart, pelgrimage, pelgrimsreis, pelgrimstocht
Polish: hadżdż, hadż