Q. Can a man tie a bun behind his head in or out of Salaah?‘
A. It is disliked (Makrooh) for a man to tie or make a bun of his hair behind his head during Salaah or out of Salaah just as a woman ties and makes a bun behind her head. (Ahsanul Fataawa 8/87)
Allah Ta’ala Knows Best
Mufti Ismaeel Bassa
themufti.com