What did the Prophet Muhammad (saw) say about those who were not able to join the Ghazwa but still shared the reward?
 Narrated Anas:                     While the Prophet was in a Ghazwa he said, "Some people have remained behind us in Medina and we never crossed a mountain path or a valley, but they were with us (i.e. sharing the reward with us), as they have been held back by a (legal) excuse. "