Al-Tabarani recorded these words from him in al-Mu'jam al-Awsat: "All the days of Tashriq are (days of) slaughter." The narrators of Ahmad and the narrators of the others are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأضاحي / 5988