Sunan an-Nasa'i, Volume 2, Book 19, Hadith 1557 (DarusSalam) ⓘ

It was narrated that Anas bin Malik said: "The people of the Jahiliyyah had two days each year when they would play. When the Messenger of Allah came to Al-Madinah he said: 'You had two days when you would play, but Allah (SWT) has given Muslims something instead that is better than them: the day of Al-Fitr and the day of Al-Adha.'"

أَخْبَرَنَا عَلِيُّ بْنُ حُجْرٍ، قَالَ أَنْبَأَنَا إِسْمَاعِيلُ، قَالَ حَدَّثَنَا حُمَيْدٌ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ كَانَ لأَهْلِ الْجَاهِلِيَّةِ يَوْمَانِ فِي كُلِّ سَنَةٍ يَلْعَبُونَ فِيهِمَا فَلَمَّا قَدِمَ النَّبِيُّ صلى الله عليه وسلم الْمَدِينَةَ قَالَ ‏ "‏ كَانَ لَكُمْ يَوْمَانِ تَلْعَبُونَ فِيهِمَا وَقَدْ أَبْدَلَكُمُ اللَّهُ بِهِمَا خَيْرًا مِنْهُمَا يَوْمَ الْفِطْرِ وَيَوْمَ الأَضْحَى ‏" ‏ ‏.‏