It is narrated from Sayyiduna Jubayr bin Mut'im (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "The whole of Mina is a place of sacrifice, and all the days of Tashriq (11th, 12th and 13th Dhul-Hijjah) are days of slaughter."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10226
Nafi' bin Jubayr bin Mut'im narrates from his father (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "All the days of Tashriq are days of slaughter."
The first (narration) is mursal, and this one is not strong, because its narrator is Suwayd.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10227