The Torah states in Leviticus 19:27: "Do not cut the hair on the corners of your head; Do not cut the corners of your beard." This is one of the rare prohibitions in the Torah that only applies to men.
The “corners of your head” is understood to refer to one’s sideburns, from the cheekbone up to the ear. Chassidic Jews take upon themselves a kabbalistic stringency to not cut the sideburn hairs at all, leaving them long enough to either curl, wrap behind their ears, or tie behind their heads underneath a yarmulka/kippa.
Non-Chassidic Jews fulfill this commandment by allowing the sideburns to grow down to the cheekbone and by not shaving above the cheekbone.
*Taking technological advances into consideration, one should make certain that this is the way the electric shaver actually performs.
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