Anas said that God’s Messenger sacrificed with his own hand two horned rams which were white with black markings, mentioned God’s name and said, "God is most great.” He added:I saw him placing his foot on their sides and saying, "In the name of God. God is most great.” (Bukhari and Muslim.)
Hadith Referenceمشكوة المصابيح / كتاب الصلاة / 1453
Hadith Gradingالألبانی:مُتَّفق عَلَيْهِ | زبیر علی زئی:متفق عليه
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «متفق عليه، رواه البخاري (5564) و مسلم (1966/18)»