1276. hadíth
وَ رُوِي: «أَنَّ اَلْأَضْحَى ثَلاَثَةُ أَيَّامٍ وَ أَفْضَلُهَا أَوَّلُهَا ».
It is narrated: "The Eid al-Adha (sacrifice) lasts for three days, and the first day is the most virtuous."
Man Lā Yaḥḍuruh al-Faqīh
Shaykh Muḥammad b. ʿAlī al-Ṣaduq
Book of Pilgrimage and Its Virtues
Chapter on the Days of Sacrifice
A fordítás angol nyelvű (Bab Ul Qaim Publications), forrás: Thaqalayn.net.