Mukhtasar Bukhari

Narrated from Sayyiduna Miswar bin Makhrama and Marwan (may Allah be pleased with them) that the Prophet Muhammad (peace and blessings be upon him) set out for the Treaty of Hudaybiyyah with more than a thousand companions, until when he reached Dhul-Hulaifah, the Prophet (peace and blessings be upon him) put a garland around the neck of the sacrificial animal and marked it with a slight wound using a knife, and assumed the Ihram for Umrah.