How can we know when a message has not been spoken by the Lord?

Deuteronomy 18:9-22

When you enter the land the Lord your God is giving you, do not learn to imitate the detestable ways of the nations there.  You must be blameless before the Lord your God.

The nations you will dispossess listen to those who practice sorcery or divination. But as for you, the Lord your God has not permitted you to do so. The Lord your God will raise up for you a prophet like me from among you, from your fellow Israelites. You must listen to him.

But a prophet who presumes to speak in my name anything I have not commanded, or a prophet who speaks in the name of other gods, is to be put to death.

You may say to yourselves, “How can we know when a message has not been spoken by the Lord?” If what a prophet proclaims in the name of the Lord does not take place or come true, that is a message the Lord has not spoken. That prophet has spoken presumptuously, so do not be alarmed.

The true prophet is one like Moses: his words are proved true by events.

Why?

God warning his people, enter the promised land do not learn to imitate the detestable way of the nation there. For it is connected to the dead and against the way of the Lord.

Keep away from sorcery or divination. There are many words said by some sorcery or medium in the world, to predict some tread or events, keep away from them.

How can we know when a message has not been spoken by the Lord? If it is said by the Lord will come true.

How?

Do what the Lord has told us, and keep in mind. May the Holy Spirit remind me away from detestable things.