Because the purified wives of the Messenger of Allah (peace be upon him) performed Hajj Tamattu’, except for Lady Aisha (may Allah be pleased with her), who performed Hajj Qiran, because she assumed the Ihram for Hajj instead of Umrah, as due to menstruation she was unable to perform the Tawaf and Sa’i of Umrah. (Thus, sacrifice was obligatory for all the wives, but in the hadith the word "Duhya" is mentioned (that he offered sacrifice on behalf of all his wives)).

Lady Aisha (may Allah be pleased with her) narrates that the Messenger of Allah (peace and blessings be upon him) sacrificed a cow on behalf of his pure wives. These are the words of the narration of Abdul Jabbar and Ali. The words of the narration of Abu Musa are as follows: When Lady Aisha (may Allah be pleased with her) became menstruating at the place of Sarif before entering Makkah, the Noble Prophet (peace and blessings be upon him) said to her: "Except for the circumambulation (Tawaf) of the Sacred House, perform all the other rites as the other pilgrims do." Lady Aisha (may Allah be pleased with her) says that when we were in Mina, meat of a cow was brought to me. I asked, "What kind of meat is this?" The noble companions replied, "The Messenger of Allah (peace and blessings be upon him) has slaughtered a cow on behalf of his wives."