(3) باب اسْتِحْبَابِ الضَّحِيَّةِ وَذَبْحِهَا مُبَاشَرَةً بِلاَ تَوْكِيلٍ وَالتَّسْمِيَةِ وَالتَّكْبِيرِ
Anas reported that Allah's Messenger (ﷺ) sacrificed two horned rams of white colour with black markings over them. He also stated:
I saw him sacrificing them with his own hand and saw him placing his foot on their sides, and recited the name of Allah and Glorified Him.
Reference: Sahih Muslim 1966 b
In-book reference: Book 35, Hadith 25
USC-MSA web (English) reference(deprecated numbering scheme): Book 22, Hadith 4842