'Add' in the Bible

Do not add or subtract a thing to what I'm commanding you. Observe the commands of the LORD your God.

Now as to everything I'm commanding you, you must be careful to observe it. Don't add to or subtract from it."

and if you are careful to observe all these commands that I am commanding you today to love the LORD your God and to walk daily in his ways then add three more cities in addition to these three cities.