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