1 John 4:1

Beloved, every spirit believe not, but prove the spirits, if of God they are, because many false prophets have gone forth to the world;

2 Peter 2:1

And there did come also false prophets among the people, as also among you there shall be false teachers, who shall bring in besides destructive sects, and the Master who bought them denying, bringing to themselves quick destruction,

1 John 2:18

Little youths, it is the last hour; and even as ye heard that the antichrist doth come, even now antichrists have become many -- whence we know that it is the last hour;

1 Thessalonians 5:21

all things prove; that which is good hold fast;

Luke 12:57

'And why, also, of yourselves, judge ye not what is righteous?

Acts 17:11

and these were more noble than those in Thessalonica, they received the word with all readiness of mind, every day examining the Writings whether those things were so;

1 Corinthians 12:10

and to another in-workings of mighty deeds; and to another prophecy; and to another discernings of spirits; and to another divers kinds of tongues; and to another interpretation of tongues:

1 Corinthians 14:29

And prophets -- let two or three speak, and let the others discern,

1 Timothy 4:1

And the Spirit expressly speaketh, that in latter times shall certain fall away from the faith, giving heed to seducing spirits and teachings of demons,

2 John 1:7

because many leading astray did enter into the world, who are not confessing Jesus Christ coming in flesh; this one is he who is leading astray, and the antichrist.

Revelation 2:2

I have known thy works, and thy labour, and thy endurance, and that thou art not able to bear evil ones, and that thou hast tried those saying themselves to be apostles and are not, and hast found them liars,

Deuteronomy 13:1-5

'When there ariseth in your midst a prophet, or a dreamer of a dream, and he hath given unto thee a sign or wonder,

Proverbs 14:15

The simple giveth credence to everything, And the prudent attendeth to his step.

Jeremiah 5:31

The prophets have prophesied falsely, And the priests bear rule by their means, And My people have loved it so, And what do they at its latter end?

Jeremiah 29:8-9

For thus said Jehovah of Hosts, God of Israel, Let not your prophets who are in your midst, and your diviners, lift you up, nor hearken ye unto their dreams, that ye are causing them to dream;

Matthew 7:15-16

'But, take heed of the false prophets, who come unto you in sheep's clothing, and inwardly are ravening wolves.

Matthew 24:4-5

And Jesus answering said to them, 'Take heed that no one may lead you astray,

Matthew 24:23-26

Then if any one may say to you, Lo, here is the Christ! or here! ye may not believe;

Mark 13:21

And then, if any may say to you, Lo, here is the Christ, or, Lo, there, ye may not believe;

Luke 21:8

And he said, 'See -- ye may not be led astray, for many shall come in my name, saying -- I am he, and the time hath come nigh; go not on then after them;

Acts 20:29

for I have known this, that there shall enter in, after my departing, grievous wolves unto you, not sparing the flock,

Romans 16:18-19

for such our Lord Jesus Christ do not serve, but their own belly; and through the good word and fair speech they deceive the hearts of the harmless,

2 Timothy 3:13

and evil men and impostors shall advance to the worse, leading astray and being led astray.

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 ariseth in your midst a prophet, or a dreamer of a dream, and he hath given unto thee a sign or wonder,
Proverbs 14:15
The simple giveth credence to everything, And the prudent attendeth to his step.
Jeremiah 5:31
The prophets have prophesied falsely, And the priests bear rule by their means, And My people have loved it so, And what do they at its latter end?
Jeremiah 29:8
For thus said Jehovah of Hosts, God of Israel, Let not your prophets who are in your midst, and your diviners, lift you up, nor hearken ye unto their dreams, that ye are causing them to dream;
Matthew 7:15
'But, take heed of the false prophets, who come unto you in sheep's clothing, and inwardly are ravening wolves.
Matthew 24:4
And Jesus answering said to them, 'Take heed that no one may lead you astray,
Romans 16:18
for such our Lord Jesus Christ do not serve, but their own belly; and through the good word and fair speech they deceive the hearts of the harmless,
2 Peter 2:1
And there did come also false prophets among the people, as also among you there shall be false teachers, who shall bring in besides destructive sects, and the Master who bought them denying, bringing to themselves quick destruction,

Try

Luke 12:57
'And why, also, of yourselves, judge ye not what is righteous?
Acts 17:11
and these were more noble than those in Thessalonica, they received the word with all readiness of mind, every day examining the Writings whether those things were so;
Romans 16:19
for your obedience did reach to all; I rejoice, therefore, as regards you, and I wish you to be wise, indeed, as to the good, and harmless as to the evil;
1 Corinthians 14:29
And prophets -- let two or three speak, and let the others discern,
1 Thessalonians 5:21
all things prove; that which is good hold fast;
Revelation 2:2
I have known thy works, and thy labour, and thy endurance, and that thou art not able to bear evil ones, and that thou hast tried those saying themselves to be apostles and are not, and hast found them liars,

General references

Deuteronomy 18:21
And when thou sayest in thy heart, How do we know the word which Jehovah hath not spoken? --
Proverbs 19:27
Cease, my son, to hear instruction -- To err from sayings of knowledge.
Matthew 24:11
'And many false prophets shall arise, and shall lead many astray;
John 8:47
he who is of God, the sayings of God he doth hear; because of this ye do not hear, because of God ye are not.'
1 Corinthians 14:32
and the spiritual gift of prophets to prophets are subject,