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.
bukhari:7399Ḥafṣ b. ʿUmar > Hishām > Qatādah > Anas

The Prophet ﷺ slaughtered two rams as sacrifice and mentioned Allah's Name and said, "Allahu-Akbar" while slaughtering).  

البخاري:٧٣٩٩حَدَّثَنَا حَفْصُ بْنُ عُمَرَ حَدَّثَنَا هِشَامٌ عَنْ قَتَادَةَ عَنْ أَنَسٍ قَالَ

ضَحَّى النَّبِيُّ ﷺ بِكَبْشَيْنِ يُسَمِّي وَيُكَبِّرُ