The pilgrimage to Kaaba (temple of Mecca), which every
Mahometan feels bound to make once at least before death. Those who
neglect to do so “might as well die Jews or Christians.” These
pilgrimages are made by caravans well supplied with water, and escorted
by 1,400 armed men for defence against brigands.
(Hebrew, hag, the festival of Jewish pilgrimages to
Jerusalem.)
“The green turban of the Mussulman distinguishes the devout hadji who
has been to Mecca.” —Stephens: Egypt, vol. i. chap. xvii. p.
240.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894