Deuteronomy 14:1 "You shall not cut yourselves"

Idol-worshipers used to scar themselves when mourning for their dead.

The Torah forbids us to follow their example.

We must never scar ourselves as an act of mourning.

The Hebrew, Titgodedu (is used in the Torah with regard to this Negative Mitzvah. The word Aggudah comes from the same root-word and means "group."

Therefore, our Sages explained that included in this Negative Mitzvah is the prohibition against separating into groups and the creation of division among our people.