“Ye are the children of the Lord your God: ye shall not cut yourselves, nor make any baldness between your eyes for the dead.” Deuteronomy 14:1 (also, Jeremiah 16:6 Jeremiah 16:7)
This has respect to rites and ceremonies used in the worship of dead and lifeless idols, the customs of the Egyptians who are said to shave their heads and their eyebrows in their sacred rites to Isis.