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حَدَّثَنَا أَحْمَدُ بْنُ حَنْبَلٍ حَدَّثَنَا عُثْمَانُ بْنُ عُثْمَانَ قَالَ أَحْمَدُ كَانَ رَجُلًا صَالِحًا قَالَ أَخْبَرَنَا عُمَرُ بْنُ نَافِعٍ عَنْ أَبِيهِ عَنْ ابْنِ عُمَرَ قَالَنَهَى رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَنْ الْقَزَعِ وَالْقَزَعُ أَنْ يُحْلَقَ رَأْسُ الصَّبِيِّ فَيُتْرَكَ بَعْضُ شَعْرِهِ

Narrated to us[Ahmad bin Hanbal], from [Uthman bin 'Uthman]—Ahmad said: he was a righteous man—who informed us ['Umar bin Nafi'] from [his father] from [Ibn 'Umar], who said: "The Messenger of Allah (peace be upon him) forbade al-qaza' al-qaza' is shaving part of a child's head and leaving part unshaven."