Ebla

mu-sa-tum /mušṭum/ - comb (VE 1359, Kogan–Krebernik 2021b: 685)

PS
*muŝṭ- - comb (Kogan–Krebernik 2021b: 685)

Oddly enough, reflected only in Arabic and Akkadian. Despite all the difficulties, Akkadian to Arabic borrowing is not to be ruled out (Kogan–Krebernik 2021a:392).