1 John 4:1

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

2 Peter 2:1

But there arose false prophets also among the people, as there will be false teachers among you also, who will stealthily bring in destructive factions, even denying the Lord that bought them; bringing upon themselves swift destruction.

1 John 2:18

My children, the last time is come; and as ye have heard that Antichrist is coming, even now there are many antichrists; whereby we know that the last time is come.

1 Thessalonians 5:21

but prove all things; hold fast that which is good;

Luke 12:57

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

Acts 17:11

These were more noble than those in Thessalonica, in that they received the word with all readiness, and searched the Scriptures daily, whether these things were so.

1 Corinthians 12:10

to another the working of miracles, to another prophecy, to another discerning of spirits, to another divers kinds of tongues, to another the interpretation of tongues.

1 Corinthians 14:29

And of the prophets let two or three speak, and let the others judge;

1 Timothy 4:1

Now the Spirit saith expressly, that in the latter times some will depart from the faith, giving heed to seducing spirits and teachings of demons,

2 John 1:7

For many deceivers went out into the world, who do not acknowledge Jesus Christ coming in the flesh; this is the deceiver and the antichrist.

Revelation 2:2

I know thy works, and thy labor, and thy endurance, and that thou canst not bear evil men; and thou didst try those who say they are apostles, and are not, and didst find them liars;

Matthew 7:15-16

Beware of the false prophets, who come to you in sheeps clothing, but inwardly are ravening wolves.

Matthew 24:4-5

And Jesus answering said to them, See that no one deceive you.

Matthew 24:23-26

Then if any one say to you, Lo! here is the Christ; or there, believe him not.

Mark 13:21

And then if any one shall say to you, See! here is the Christ; see! there; believe him not.

Luke 21:8

And he said, Take heed that ye be not deceived. For many will come in my name, saying, I am He, and the time is at hand. Go not after them.

Acts 20:29

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

Romans 16:18-19

For such men are not servants of our Lord Christ, but of their own appetites; and by good words and fair speeches they deceive the hearts of the simple.

2 Timothy 3:13

But evil men and impostors will wax worse and 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

Matthew 7:15
Beware of the false prophets, who come to you in sheeps clothing, but inwardly are ravening wolves.
Matthew 24:4
And Jesus answering said to them, See that no one deceive you.
Romans 16:18
For such men are not servants of our Lord Christ, but of their own appetites; and by good words and fair speeches they deceive the hearts of the simple.
2 Peter 2:1
But there arose false prophets also among the people, as there will be false teachers among you also, who will stealthily bring in destructive factions, even denying the Lord that bought them; bringing upon themselves swift destruction.

Try

Luke 12:57
And why even of yourselves do ye not judge what is right?
Acts 17:11
These were more noble than those in Thessalonica, in that they received the word with all readiness, and searched the Scriptures daily, whether these things were so.
Romans 16:19
For your obedience hath become known to all. Over you, then, I rejoice; but I would have you wise as to that which is good, and simple as to that which is evil.
1 Corinthians 14:29
And of the prophets let two or three speak, and let the others judge;
1 Thessalonians 5:21
but prove all things; hold fast that which is good;
Revelation 2:2
I know thy works, and thy labor, and thy endurance, and that thou canst not bear evil men; and thou didst try those who say they are apostles, and are not, and didst find them liars;

General references

Matthew 24:11
And many false prophets will arise, and will deceive many.
John 8:47
He that is of God heareth Gods words; for this cause ye do not hear, because ye are not of God.
1 Corinthians 14:32
And spirits of prophets are subject to prophets;