What was the Prophet Muhammad's (saw) response when the woman from the tribe of Khath'am asked if her father's obligation to perform Hajj would be fulfilled if she performed it on his behalf?
 Narrated Ibn `Abbas:                     A woman from the tribe of Khath'am came in the year (of ,Hajjat-al-Wada` of the Prophet ) and said, "O Allah's Apostle! My father has come under Allah's obligation of performing Hajj but he is a very old man and cannot sit properly on his Mount. Will the obligation be fulfilled if I perform Hajj on his behalf?" The Prophet replied in the affirmative.