When they had gone through the Arabah to the southern extremity, the Lord commanded them to turn northwards, i.e., to go round the southern end of Mount Seir, and proceed northwards on the eastern side of it (see at Numbers 21:10), without going to war with the Edomites (התגּרה, to stir oneself up against a person to conflict, מלחמה), as He would not give them a foot-breadth of their land; for He had given Esau (the Edomites) Mount Seir for a possession. For this reason they were to buy victuals and water of them for money (כּרה, to dig, to dig water, i.e., procure water, as it was often necessary to dig wells, and not merely to draw it, Genesis 26:25. The verb כּרה does not signify to buy).

Deuteronomy 2:10 Parallel Commentaries

All the nations here mentioned appear to have been the posterity of Ham, who lay under the prophetical curse of Noah, which was thus executed upon this part of then by the Moabites and Edomites.

Deuteronomy 2:11 Which also were accounted giants, as the Anakims; but the Moabites called them Emims.

Genesis 14:5 And in the fourteenth year came Chedorlaomer, and the kings that were with him, and smote the Rephaims in Ashteroth Karnaim...