The covering sheets of Budn are to be given in charity Sahih al-Bukhari 1718
Translation
Narrated `Ali
The Prophet (ﷺ) offered one hundred Budn as Hadi and ordered me to distribute their meat (in charity) and I did so. Then he ordered me to distribute their covering sheets in charity and I did so. Then he ordered me to distribute their skins in charity and I did so.