The prohibition of fasting the days of At-Tashriq, which are the days of eating, drinking and remembering Allah, The Mighty and Sublime
وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا مُحَمَّدُ بْنُ سَابِقٍ، حَدَّثَنَا إِبْرَاهِيمُ بْنُ طَهْمَانَ، عَنْ أَبِي الزُّبَيْرِ، عَنِ ابْنِ كَعْبِ بْنِ مَالِكٍ، عَنْ أَبِيهِ، أَنَّهُ حَدَّثَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم بَعَثَهُ وَأَوْسَ بْنَ الْحَدَثَانِ أَيَّامَ التَّشْرِيقِ فَنَادَى " أَنَّهُ لاَ يَدْخُلُ الْجَنَّةَ إِلاَّ مُؤْمِنٌ . وَأَيَّامُ مِنًى أَيَّامُ أَكْلٍ وَشُرْبٍ " .
Ibn Ka'b b. Malik reported on the authority of his father that the Messenger of Allah (ﷺ) sent him and Aus b. Hadathan during the days of Tashriq to make this announcement: None but the believer would be admitted into Paradise, and the days of Mina' are the days meant for eating and drinking.