Authentic
Sunan Ibn Majah 1720
The Messenger of Allah (ﷺ) delivered a sermon on the days of Tashriq (11th, 12th, and 13th of Dhul-Hijjah) and said: “No one will enter Paradise but a Muslim soul, and these days are the days of eating and drinking.”
" لاَ يَدْخُلُ الْجَنَّةَ إِلاَّ نَفْسٌ مُسْلِمَةٌ. وَإِنَّ هَذِهِ الأَيَّامَ أَيَّامُ أَكْلٍ وَشُرْبٍ "