Muwatta Malik #938
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 يَحْيَى بْنِ سَعِيدٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، أَنَّ عُمَرَ بْنَ الْخَطَّابِ، قَالَ مَنْ عَقَصَ رَأْسَهُ أَوْ ضَفَرَ أَوْ لَبَّدَ فَقَدْ وَجَبَ عَلَيْهِ الْحِلاَقُ .
Yahya related to me from Malik from Yahya ibn Said from Said ibn
al-Musayyab that Umar ibn al-Khattab said, "Anyone who has braided his
hair, or plaited it or matted it must shave his head."
About Muwatta Malik
This hadith is #938 from Muwatta Malik, in the Book of Hajj.