ßÊÇÈ ÇáÌåÇÏ æÇáÓíÑ : Hadeeth No:2650 : 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. "...