Chapter: It is permissible to share in the sacrifice, and a camel or a cow is sufficient for seven people
Jabir b. 'Abdullah (Allah be pleased with them) reported that Allah's Messenger ( صلی اللہ علیہ وسلم ) sacrificed (animals) on behalf of his wives, and in the hadith transmitted by Ibn Abu Bakr (the words are): A cow on behalf of 'A'isha on the occasion of the Hajj.
Authentic