And he provided the first part for himself, because there, in a portion of the lawgiver, was he seated; and he came with the heads of the people, he executed the justice of the LORD, and his judgments with Israel. He provided the first part - That is, he chose for himself a very excellent portion, viz., the land of Sihon and Og, in which this tribe had requested to be settled by the lawgiver, viz., Moses, from whom they requested this portion, Numbers 32:1-5.
He came with the heads of the people - Notwithstanding this portion fell unto them on the east side of Jordan, yet they proceeded with the heads of the people, the chiefs of the other tribes.
To execute the justice of the Lord - To extirpate the old inhabitants of the country, according to the decree and purpose of the Lord. See on Numbers 32 (note).