Muwatta Malik
Book 20, Hadith 201
Arabic hadith text
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 .
Translation
Yahya related to me from Malik from Yahya ibn Said from Said ibnal-Musayyab that Umar ibn al-Khattab said, "Anyone who has braided hishair, or plaited it or matted it must shave his head."