'Instruct' in the Bible

For a long time Israel had no true God, or priest to instruct them, or law.

Whenever any dispute comes to you from your brothers (relatives) who live in their cities, between blood and blood, between law and commandment, or between statutes and judgments, you are to warn [and instruct] them so that they may not be guilty before the Lord; otherwise [God’s] wrath will come on you and your brothers. Do this and you will not be guilty.