What did 'Umar say was one of the two kinds of Jihad that the Prophet Muhammad (saw) encouraged?
 Narrated 'Aishah:                      The Prophet () sent my brother, 'Abdur Rahman with me to Tan'im for the 'Umra, and he made me ride on the packsaddle (of a camel). 'Umar said, "Be ready to travel for Hajj as it (Hajj) is one of the two kind of Jihad".