Sunan Abi Dawud 1859
سنن أبي داود#1859Da'ifحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا اللَّيْثُ، عَنْ نَافِعٍ، أَنَّ رَجُلاً، مِنَ الأَنْصَارِ أَخْبَرَهُ عَنْ كَعْبِ بْنِ عُجْرَةَ، - وَكَانَ قَدْ أَصَابَهُ فِي رَأْسِهِ أَذًى فَحَلَقَ فَأَمَرَهُ النَّبِيُّ صلى الله عليه وسلم أَنْ يُهْدِيَ هَدْيًا بَقَرَةً .
A man from the Ansar said on the authority of Ka'b ibn Ujrah that he was feeling pain in his head (due to lice); so he shaved his head. The Prophet (ﷺ) ordered him to sacrifice a cow as offering
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Al-AlbaniDaif
Muhammad Muhyi Al-Din Abdul HamidDaif
Zubair Ali ZaiDaif
In-book reference: 11:139