Sunan Abi Dawud 22364
In-book no 1860حَدَّثَنَا 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.