Sunan an-Nasa'i, Volume 5, Book 43, Hadith 4391 (DarusSalam) ⓘ
It was narrated that Ans said: "The Messenger of Allah sacrificed two Amlah rams."
أَخْبَرَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، عَنْ خَالِدٍ، قَالَ حَدَّثَنَا حُمَيْدٌ، عَنْ ثَابِتٍ، عَنْ أَنَسٍ، قَالَ ضَحَّى رَسُولُ اللَّهِ صلى الله عليه وسلم بِكَبْشَيْنِ أَمْلَحَيْنِ .
also referenced under: Hadith 4386 (Reference) & Book 43, Hadith 26 (In-Book)