Deuteronomy 2:4 - Matthew Poole's English Annotations on the Holy Bible

Through the coast, or, by or near the coast or border; for they did not pass through their borders, as it is said, Numbers 20:21. And the particle beth doth oft signify by or near, as Genesis 37:13 Joshua 5:13 Judges 8:5 Jeremiah 32:7. Thus that difference may be reconciled, which others reconcile thus, that they at first denied it, but afterwards granted it. Which dwell in Seir: these words restrain the prohibition to these particular children of Esau, for there were another sort or branch of Esau's children, which were to be meddled with and destroyed, even the Amalekites, Exodus 17:14 Deuteronomy 25:17, who were Esau's posterity, Genesis 36:12. They shall be afraid of you; but I charge you take no advantage of their fears, which you will be very apt to do.