Take ye then good heed that you stir not against them. For I will not give you of their land so much as the step of one foot can tread upon, because I have given mount Seir to Esau, for a possession.
אַל־תִּתְגָּר֣וּ בָ֔ם כִּ֠י לֹֽא־אֶתֵּ֤ן לָכֶם֙ מֵֽאַרְצָ֔ם עַ֖ד מִדְרַ֣ךְ כַּף־רָ֑גֶל כִּֽי־יְרֻשָּׁ֣ה לְעֵשָׂ֔ו נָתַ֖תִּי אֶת־הַ֥ר שֵׂעִֽיר׃
2 Church Fathers comment on this verse
God forbade them from engaging in battle with the Idumeans. This was intended to ensure that the Israelites, emboldened by His silence after the conflict with Sihon, would not launch further attacks. Instead, they would come to understand their enemies and allies. In the wilderness, He provided them with a law by means of actions, guiding them on how to interact with those they encountered.
I will not allow you to harm the descendants of Esau or seize their inheritance. Such actions would be both unfair and futile since the Lord has granted this land to them by taking it from the Horreans.
Passages read together with this verse.
THEOSIS