“The edges of your beard”
You must not cut off the hair at the sides of your head or clip off the edges of your beard. (Leviticus 19:27 BSB)
What it sounds like today
A random rule about haircuts and beard trimming.
The cultural key
This grooming law is one many readers find puzzling, but it has both an ancient rationale and a living legacy. The prohibition on 'rounding off' the hair at the temples and marring the edges of the beard most likely targeted specific pagan practices: surrounding peoples cut their hair and beards in particular ways for the cults of the dead and for idolatrous priesthood (the next verse forbids gashing oneself for the dead and tattooing). Israel was to look different from the nations even in appearance, its bodies not conformed to pagan mourning and worship. Observant Judaism has kept the command literally ever since: it is the reason Orthodox and Hasidic Jewish men leave the hair at the sides of the head uncut, the peyot or sidelocks, and do not shave off the edges of the beard. A modern reader sees an arbitrary barber rule; the first hearers heard a call to be visibly set apart from pagan custom, a distinctiveness still worn today.
Recovered meaning
The ban on cutting the side-hair and beard-edges likely targeted pagan mourning and cultic grooming, keeping Israel visibly distinct from the nations. Observant Jews still keep it, hence the sidelocks (peyot) and uncut beard-edges of Orthodox men.