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.

وَعَنْ نُبَيْشَةَ اَلْهُذَلِيِّ ‏- رضى الله عنه ‏- قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ أَيَّامُ اَلتَّشْرِيقِ أَيَّامُ أَكْلٍ وَشُرْبٍ, وَذِكْرٍ لِلَّهِ عَزَّ وَجَلَّ } رَوَاهُ مُسْلِمٌ ‏ .‏