Judges 3:4

And they were to prove Israel by them, to know whether they would hearken unto the commandments of the LORD, which he commanded their fathers by the hand of Moses.

They were [left], to prove Israel by them, to know whether they would listen to the commandments of Yahweh, which he commanded their fathers by Moses.

And they were `left', to prove Israel by them, to know whether they would hearken unto the commandments of Jehovah, which he commanded their fathers by Moses.

and they are to prove Israel by them, to know whether they obey the commands of Jehovah that He commanded their fathers by the hand of Moses.

These nations were left to test the Israelites, to find out whether they would keep the commandments of the LORD, which He had given their fathers through Moses.