Bulugh al-Maram 2 The Book of Prayer كتاب الصلاة 423

وَعَنْ أَنَسٍ قَالَ: { قَدِمَ رَسُولُ اَللَّهِ – صلى الله عليه وسلم -اَلْمَدِينَةَ, وَلَهُمْ يَوْمَانِ يَلْعَبُونَ فِيهِمَا. فَقَالَ: “قَدْ أَبْدَلَكُمُ اَللَّهُ بِهِمَا خَيْرًا مِنْهُمَا: يَوْمَ اَلْأَضْحَى, وَيَوْمَ اَلْفِطْرِ } أَخْرَجَهُ أَبُو دَاوُدَ, وَالنَّسَائِيُّ بِإِسْنَادٍ صَحِيحٍ 1 . 1 – صحيح. رواه أبو داود (1134)، والنسائي (3/179-180).

Narrated Anas (RA) that when Allah’s Messenger (صلى الله عليه وسلم) came to al-Madinah, the people had two days on which they engaged in games. He (صلى الله عليه وسلم) said: “Allah has substituted for you something better than them: the day of sacrifice and the day of breaking the fast.” [Reported by Abu Dawud and an-Nasa’i; with a Sahih Isnad (authentic chain)].