JDG 3:4

4 And he left them, that in them he should assay Israel, (to see) whether they would hear the behests of the Lord, which he commanded to their fathers by the hand of Moses, either nay. (Yea, he left themalive, so that through them he could test Israel, to see whether they would listen to the Lord’s commands, which he commanded to their fathers through Moses, or not.)