Nubaishah Al-Hudhali (RAA) narrated that The Messenger of Allah (ﷺ) said:
"The days of Tashriq (the three days following 'Idul Ad-ha, i.e. 11th , 12th and 13th of Dhul Hijjah) are days of eating, drinking and remembering (dhikr) of Allah, the Most Great and Glorious." Related by Muslim. (IT)
English reference (IT): Book 5, Hadith 707 (IT)
Arabic reference (IT): Book 5, Hadith 687 (IT)