The Messenger of Allah ﷺ said, "The days of Tashriq are days of eating, drinking, and remembering Allah ."
حدثنا هشيم أخبرنا خالد عن أبي المليح
قال رسول الله ﷺ أيام التشريق أيام أكل وشرب وذكر الله عز وجل
Its isnad is sahih, its narrators are reliable and well known.The hadith was narrated by Muslim (2/800, no. 1141) and Ibn Majah (1/548, no. 719), and the hadith has already appeared at 18857.