Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:4-850bʿLy
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السيوطي:٤-٨٥٠b

"عن عليٍّ قالَ: الأيامُ المعدواتُ ثَلاثَةُ أيامٍ: يَوْمُ النحر، ويومانِ بعدَهُ، اذبَحْ في أيِّهَا شئتَ، وَأَفْضَلُهَا أَوّلُهَا".  

عبد بن حميد، وابن أبى الدنيا

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Collected by Suyūṭī