1 John 4:1

Dearly beloved, believe not every spirit, but try the spirits if they are of God: for many false prophets have come out into the world.

2 Peter 2:1

And also were there false prophets among the people, as also among you shall be false teachers, who shall privately bring in doctrines of perdition, and denying the master having purchased them, having brought upon themselves swift destruction.

1 John 2:18

Young children, it is the last hour: and as ye have heard that antichrist comes, and now many antichrists have come; whence we know that it is the last hour.

1 Thessalonians 5:21

Try all things; hold the good.

Luke 12:57

And why also of yourselves judge ye not the just thing?

Acts 17:11

And they were of more noble birth than those in Thessalonica, who received the word with all willingness, and examined the writings daily, if these things might hold thus.

1 Corinthians 12:10

And to another performances of powers; and to another discriminations of spirits; and to another kinds of tongues; and to another interpretation of tongues:

1 Corinthians 14:29

And let the prophets speak two or three, and let others decide.

1 Timothy 4:1

And the Spirit says expressly, that in later times some shall be removed from the faith, holding to deceitful spirits, and doctrines of evil spirits;

2 John 1:7

For many cheats come into the world, they not acknowledging Jesus Christ coming in the flesh. This is the cheat and antichrist.

Revelation 2:2

I know thy works, and thy fatigue, and thy patience, and that thou canst not bear the wicked: and thou bast tried them saying they are sent, and are not, and thou Last found them liars:

Deuteronomy 13:1-5

When there shall arise in the midst of you a prophet, or a dreamer of dreams, and he gave to thee a sign or a wonder,

Proverbs 14:15

The simple will believe to every word: and the prudent will understand to his going.

Jeremiah 5:31

The prophets prophesied in falsehood, and the priests will spread out with their hands; and my people loved it thus: and what will ye do to its last part

Jeremiah 29:8-9

For thus said Jehovah of armies, God of Israel, Your prophets in the midst of you shall not deceive to you, and your diviners and you shall not hear to your dreams which ye dream.

Matthew 7:15-16

And hold from false prophets which come in to you in sheep's dresses, but within they are rapacious wolves.

Matthew 24:4-5

And Jesus having answered, said to them, See lest any lead you astray.

Matthew 24:23-26

Then if any say to you, Behold, here Christ, or there; believe ye not.

Mark 13:21

And if any say to you, Behold, here Christ; or, behold, there; believe ye not:

Luke 21:8

And he said, See ye, be not deceived: for many shall come in my name,. saying, That I am; and the time has drawn near: therefore go not after them.

Acts 20:29

For I know this, that there shall come in after my departure grievous wolves to you, not sparing the flock.

Romans 16:18-19

For such serve not our Lord Jesus Christ, but their own belly; and by specious language and praise completely deceive the hearts of the innocent.

2 Timothy 3:13

And evil men and impostors shall proceed 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
When there shall arise in the midst of you a prophet, or a dreamer of dreams, and he gave to thee a sign or a wonder,
Proverbs 14:15
The simple will believe to every word: and the prudent will understand to his going.
Jeremiah 5:31
The prophets prophesied in falsehood, and the priests will spread out with their hands; and my people loved it thus: and what will ye do to its last part
Jeremiah 29:8
For thus said Jehovah of armies, God of Israel, Your prophets in the midst of you shall not deceive to you, and your diviners and you shall not hear to your dreams which ye dream.
Matthew 7:15
And hold from false prophets which come in to you in sheep's dresses, but within they are rapacious wolves.
Matthew 24:4
And Jesus having answered, said to them, See lest any lead you astray.
Romans 16:18
For such serve not our Lord Jesus Christ, but their own belly; and by specious language and praise completely deceive the hearts of the innocent.
2 Peter 2:1
And also were there false prophets among the people, as also among you shall be false teachers, who shall privately bring in doctrines of perdition, and denying the master having purchased them, having brought upon themselves swift destruction.

Try

Luke 12:57
And why also of yourselves judge ye not the just thing?
Acts 17:11
And they were of more noble birth than those in Thessalonica, who received the word with all willingness, and examined the writings daily, if these things might hold thus.
Romans 16:19
For your obedience has come to all. Therefore I rejoice for you: and I wish you truly to be wise to good, and pure to evil.
1 Corinthians 14:29
And let the prophets speak two or three, and let others decide.
1 Thessalonians 5:21
Try all things; hold the good.
Revelation 2:2
I know thy works, and thy fatigue, and thy patience, and that thou canst not bear the wicked: and thou bast tried them saying they are sent, and are not, and thou Last found them liars:

General references

Deuteronomy 18:21
And when thou shalt say in thy heart, How shall we know the word which Jehovah spake not?
Proverbs 19:27
Cease, my son, to hear instructions for erring from the words of knowledge.
Matthew 24:11
And many false prophets shall be raised up, and deceive many.
John 8:47
He being of God hears the words of God: therefore ye hear not, for ye are not of God.
1 Corinthians 14:32
And the spirits of the prophets are subjected to the prophets.