A righteous person — i.e., righteous, not at fault, so far as the matter in hand and his relation to the assassins is concerned.
Take you away from the earth. — “Rather, put you away out of the land. The word is one specially used of removing evil or the guilt of evil from the land (Deuteronomy 19:13; Deuteronomy 19:19, &c.). The guilt of murder defiled the land, until expiated by the execution of the murderer. (Numbers 35:33.)” — Kirkpatrick.