Umm Bilal (may Allah be pleased with her), a woman of the tribe of Aslam, whose father (may Allah be pleased with him) was with the Messenger of Allah (peace and blessings be upon him) on the day of Hudaybiyah, says that the Messenger of Allah (peace and blessings be upon him) said: "Sacrifice the jadha'ah of sheep, for it is permissible."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19072