Authentic
graded by Al-Albani
Mishkat al-Masabih 1473
وَعَنْ نَافِعٍ أَنَّ ابْنَ عُمَرَ قَالَ: الْأَضْحَى يَوْمَانِ بعد يَوْم الْأَضْحَى. رَوَاهُ مَالك
وَقَالَ: وَبَلَغَنِي عَنْ عَلِيِّ بْنِ أَبِي طَالِبٍ مثله
Nafi‘ reported Ibn ‘Umar as saying, “The festival of sacrifice lasts two days after the day of sacrifice.” Malik transmitted it, and he said he had heard something similar from ‘Alib. Abu Talib.
Reported by Malik (No. 1042). Cited in Mishkat al-Masabih (No. 1473).