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.
حَدَّثَنَا 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 .
AbuDaud
The Rites of Hajj (Kitab Al-Manasik Wa'l-Hajj) • Hadith 1859