Mishkat al-Masabih
Mishkat al-Masabih 1473, 1474
وَعَنْ نَافِعٍ أَنَّ ابْنَ عُمَرَ قَالَ: الْأَضْحَى يَوْمَانِ بعد يَوْم الْأَضْحَى. رَوَاهُ مَالك وَقَالَ: وَبَلَغَنِي عَنْ عَلِيِّ بْنِ أَبِي طَالِبٍ مثله
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
Nafi reported that Ibn Umar said: “The Festival of Sacrifice is two days after the Day of Sacrifice.”
Malik transmitted it and said: “I have been told something similar from Ali ibn Abi Talib.”
Notes and open questions — unreviewed
الْأَضْحَى يَوْمَانِ بعد يَوْم الْأَضْحَى
The concise wording may refer to the festival period extending for two days after the principal sacrifice day; the intended counting is not explicit.
Does this phrase state that the festival continues for two days after the Day of Sacrifice, or another counting convention?