It was narrated from ‘Aishah that the Messenger of Allah ﷺ sacrificed one cow during the Farewell Pilgrimage on behalf of the family of Muhammad ﷺ. (Using translation from Ibn Mājah 3135)
أَنَّ رَسُولَ اللهِ ﷺ «نَحَرَ عَنْ آلِ مُحَمَّدٍ فِي حَجَّةِ الْوَدَاعِ بَقَرَةً وَاحِدَةً»