1 John 4:1

Beloved, do not believe every spirit, but try the spirits to see if they are of God, because many false prophets have gone out into the world.

2 Peter 2:1

But there were also false prophets among the people, even as there will be false teachers among you, who secretly will bring in destructive heresies, even denying the Master who bought them, bringing on themselves swift destruction.

1 John 2:18

Little children, it is the last time. And just as you have heard that antichrist is coming, even now many antichrists have risen up, from which we know that it is the last hour.

1 Thessalonians 5:21

Prove all things, hold fast to the good.

Luke 12:57

And why, even of yourselves, do you not judge what is right?

Acts 17:11

And these were more noble than those of Thessalonica, in that they received the Word with all readiness of mind and searched the Scriptures daily to see if those things were so.

1 Corinthians 12:10

and to another workings of powers, to another prophecy; and to another discerning of spirits; and to another kinds of tongues; and to another the interpretation of tongues.

1 Corinthians 14:29

And if there are two or three prophets, let them speak, and let the others judge.

1 Timothy 4:1

But the Spirit expressly says that in the latter times some shall depart from the faith, giving heed to seducing spirits and teachings of demons,

2 John 1:7

For many deceivers have entered into the world, who do not confess Jesus Christ coming in the flesh. This is the deceiver and the anti-christ.

Revelation 2:2

I know your works and your labor and your patience, and how you cannot bear those who are evil. And you tried those pretending to be apostles, and are not, and have found them liars.

Deuteronomy 13:1-5

If a prophet rises among you, or a dreamer of dreams, and gives you a sign or a wonder,

Proverbs 14:15

The simple believes every word, but the wise man watches his step.

Jeremiah 5:31

The prophets prophesy falsely, and the priests bear rule by their means; and my people love to have it so, and what will you do at the end of it?

Jeremiah 29:8-9

For so says Jehovah of Hosts, the God of Israel: Do not let your prophets and your fortune-tellers in your midst deceive you, nor listen to your dreams which you dream.

Matthew 7:15-16

Beware of false prophets who come to you in sheep's clothing, but inwardly they are ravening wolves.

Matthew 24:4-5

And Jesus answered and said to them, Take heed that no man deceive you.

Matthew 24:23-26

Then if any man shall say to you, Lo, here is Christ! Or, There! Do not believe it.

Mark 13:21

And then if anyone shall say to you, Lo, here is Christ! Or, lo, there! Do not believe him.

Luke 21:8

And He said, Take heed that you are not deceived, for many shall come in My name, saying, I AM! Also, The time has come! Do not go after them.

Acts 20:29

For I know this, that after my departure grievous wolves shall enter in among you, not sparing the flock.

Romans 16:18-19

For they who are such do not serve our Lord Jesus Christ, but their own belly; and by good words and fair speeches they deceive the hearts of the simple.

2 Timothy 3:13

But evil men and seducers will go forward to worse, deceiving and being deceived.

Treasury of Scripture Knowledge

Summary

Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.

Bible References

Believe not

Deuteronomy 13:1
If a prophet rises among you, or a dreamer of dreams, and gives you a sign or a wonder,
Proverbs 14:15
The simple believes every word, but the wise man watches his step.
Jeremiah 5:31
The prophets prophesy falsely, and the priests bear rule by their means; and my people love to have it so, and what will you do at the end of it?
Jeremiah 29:8
For so says Jehovah of Hosts, the God of Israel: Do not let your prophets and your fortune-tellers in your midst deceive you, nor listen to your dreams which you dream.
Matthew 7:15
Beware of false prophets who come to you in sheep's clothing, but inwardly they are ravening wolves.
Matthew 24:4
And Jesus answered and said to them, Take heed that no man deceive you.
Romans 16:18
For they who are such do not serve our Lord Jesus Christ, but their own belly; and by good words and fair speeches they deceive the hearts of the simple.
2 Peter 2:1
But there were also false prophets among the people, even as there will be false teachers among you, who secretly will bring in destructive heresies, even denying the Master who bought them, bringing on themselves swift destruction.

Try

Luke 12:57
And why, even of yourselves, do you not judge what is right?
Acts 17:11
And these were more noble than those of Thessalonica, in that they received the Word with all readiness of mind and searched the Scriptures daily to see if those things were so.
Romans 16:19
For your obedience reached to all. Therefore I am glad on your behalf, But I would have you truly wise as to good, and simple toward evil.
1 Corinthians 14:29
And if there are two or three prophets, let them speak, and let the others judge.
1 Thessalonians 5:21
Prove all things, hold fast to the good.
Revelation 2:2
I know your works and your labor and your patience, and how you cannot bear those who are evil. And you tried those pretending to be apostles, and are not, and have found them liars.

General references

Deuteronomy 18:21
And if you say in your heart, How shall we know the word which Jehovah has not spoken?
Proverbs 19:27
My son, cease to hear the discipline, only to stray from the words of knowledge.
Matthew 24:11
And many false prophets will rise and deceive many.
John 8:47
He who is of God hears God's Words. Therefore you do not hear them because you are not of God.
1 Corinthians 14:32
And the spirits of the prophets are subject to the prophets.