Test the spirits

"Beloved, do not trust every spirit but test the spirits to see whether they belong to God, because many false prophets have gone out into the world.

This is how you can know the Spirit of God: every spirit that acknowledges Jesus Christ come in the flesh be longs to God,

and every spirit that does not acknowledge Jesus does not belong to God. This is the spirit of the antichrist that, as you heard, is to come, but in fact is already in the world." (1 John 4: 1-3)

"Beware of false prophets, who come to you in sheep's clothing, but underneath are ravenous wolves.

By their fruits you will know them. Do people pick grapes from thornbushes, or figs from thistles?

Just so, every good tree bears good fruit, and a rotten tree bears bad fruit.

A good tree cannot bear bad fruit, nor can a rotten tree bear good fruit.

Every tree that does not bear good fruit will be cut down and thrown into the fire.

So by their fruits you will know them." (Matthew 7: 15-20)

"The way we may be sure that we know him is to keep his commandments.

Whoever says, "I know him," but does not keep his commandments is a liar, and the truth is not in him.

But whoever keeps his word, the love of God is truly perfected in him. This is the way we may know that we are in union with him:

whoever claims to abide in him ought to live (just) as he lived." (1 John 2: 3-6)