Leviticus 21:5

Overview - Leviticus 21
Of the priests' mourning.
Of their holiness.
Of their marriages.
Of their estimation.
Of the priest's daughter convicted of whoredom.
10 Of the high priest's holiness.
13 Of his marriage.
16 The priests that have blemishes must not minister in the sanctuary.
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Leviticus 21:5  (King James Version)
They shall not make baldness upon their head, neither shall they shave off the corner of their beard, nor make any cuttings in their flesh.

not make baldness
This custom is also called rounding the corners of the head, (ch. 19:27, ) and seems to have been performed in honour of
some idol. 10:6 Leviticus 19:27 Leviticus 19:28 Deuteronomy 14:1 ; Isaiah 15:2 ; 22:12 Jeremiah 16:6 ; 48:37 Ezekiel 44:20
Amos 8:10 ; Micah 1:16

the corner
The Hebrew {peath zakon}, may denote the whiskers; as the Syriac {phatho} signifies. These are by the Arabs, according to Niebuhr, still cut entirely off, or worn quite short; and hence they are called by Jeremiah, [qtswtsy p'h,] those with cropped whiskers. Perhaps some superstition, of which we are ignorant, was connected with this; but whether or not, it was the object of Moses to keep the Israelites distinct from other nations.