Muwatta Malik #884
Hajj
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ إِذَا طَعَنَ فِي سَنَامِ هَدْيِهِ وَهُوَ يُشْعِرُهُ قَالَ بِسْمِ اللَّهِ وَاللَّهُ أَكْبَرُ .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar
said, when nicking the hump of his sacrificial animal to brand it, "In
the name of Allah, and Allah is greater."
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About Muwatta Malik
This hadith is #884 from Muwatta Malik, in the Book of Hajj.