Albert Barnes Commentary Deuteronomy 14:1

"Ye are the children of Jehovah your God: ye shall not cut yourselves, nor make any baldness between your eyes for the dead." — Deuteronomy 14:1 (ASV)

Make any baldness between your eyes - that is, by shaving the front part of the head and the eyebrows. The practices named in this verse were common among pagans, and seem to be forbidden, not only because such wild excesses of grief (compare 1 Kings 18:28) would be inconsistent in those who, as children of a heavenly Father, had prospects beyond this world, but also because these usages themselves arose out of idolatrous notions.