וְרֹאשָׁם֙ לֹ֣א יְגַלֵּ֔חוּ וּפֶ֖רַע לֹ֣א יְשַׁלֵּ֑חוּ כָּס֥וֹם יִכְסְמ֖וּ אֶת־רָאשֵׁיהֶֽם׃
Neither shall they shave their heads, nor suffer their locks to grow long; they shall only poll their heads.
Rashi on Ezekiel
And [the hair of] their heads they are not to shave to remove all the hair.
Rashi on Ezekiel
but also not to let it grow wild They may not let their hair grow very long.
Rashi on Ezekiel
they must be careful to trim [Heb. כָּסוּם יִכְסְמוּ, (to cut the hair so that it appears)] like spelt (כֻּסֶמֶת), which is arranged on the ear [with] the end of one beside the root of another. So I heard in the name of Rabbi Menahem of blessed memory. It is possible to explain it as an expression for a measure of a medium thing, neither shearing [all the hair of] the head nor letting the hair grow long, but a medium amount, amo(d)ler in O.F., to cut to medium length.