HAJJATU’L-WADA حجة الوداع.
The last or farewell pilgrimage performed by Muhammad, and which is taken as the model of an orthodox hajj. It is called the Hajju ‘l-Akbar, or Greater Pilgrimage, in the Qur’an. Surah ix. 3 (See Mishkat, book xi. ch iii., and Muir’s Life of Mahomet.) It is supposed to have commence February 23, A.D. 632.

Based on Hughes, Dictionary of Islam