It is narrated from Hazrat Aisha (may Allah be pleased with her) that I used to twist the collars of the sacrificial animals of the Prophet (peace and blessings be upon him) with my own hands, then the Prophet (peace and blessings be upon him) would tie the collars on them, mark them, and send them towards the House of Allah, while he himself would remain in Madinah and would not make anything lawful forbidden upon himself.