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.

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 3:2

and saying, Repent, for the kingdom of Heaven is at hand.

Matthew 4:17

From that time Jesus began to preach and to say, Repent! For the kingdom of Heaven is at hand.

Ephesians 5:6

Let no man deceive you with vain words, for because of these things the wrath of God comes upon the children of disobedience.

2 Thessalonians 2:3

Let not anyone deceive you by any means. For that Day shall not come unless there first comes a falling away, and the man of sin shall be revealed, the son of perdition,

Matthew 24:4-5

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

Matthew 24:11

And many false prophets will rise and deceive many.

Matthew 24:23-25

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

Mark 13:5-6

And Jesus answering them began to say, Beware that no one deceive you.

Mark 13:21-23

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

Luke 17:23

And they shall say to you, Lo, here! or, behold, there! Do not go away, nor follow.

John 5:43

I have come in My Father's name, and you do not receive Me. If another shall come in his own name, him you will receive.

John 8:24

Therefore I said to you that you shall die in your sins, for if you do not believe that I AM, you shall die in your sins.

Acts 5:36-37

For before these days Theudas rose up, boasting himself to be somebody; a number of men, about four hundred, joined themselves to him; who was slain. And all, as many as obeyed him, were scattered and brought to nothing.

Acts 8:9-10

But a certain man called Simon had long been conjuring in the city, and amazing the nation of Samaria, claiming himself to be some great one.

2 Corinthians 11:13-15

For such ones are false apostles, deceitful workers, transforming themselves into the apostles of Christ.

2 Thessalonians 2:9-11

whose coming is according to the working of Satan with all power and signs and lying wonders,

2 Timothy 3:13

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

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 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 1:3

Blessed is the one who reads and hears the Words of this prophecy, and the ones keeping the things written in it, for the time is near.

Revelation 12:9

And the great dragon was cast out, the old serpent called Devil, and Satan, who deceives the whole world. He was cast out into the earth, and his angels were cast out with him.

Treasury of Scripture Knowledge

Summary

And he said, Take heed that ye be not deceived: for many shall come in my name, saying, I am Christ; and the time draweth near: go ye not therefore after them.

General references

Bible References

For

John 5:43
I have come in My Father's name, and you do not receive Me. If another shall come in his own name, him you will receive.
Acts 5:36
For before these days Theudas rose up, boasting himself to be somebody; a number of men, about four hundred, joined themselves to him; who was slain. And all, as many as obeyed him, were scattered and brought to nothing.
Acts 8:9
But a certain man called Simon had long been conjuring in the city, and amazing the nation of Samaria, claiming himself to be some great one.

And the time

Matthew 3:2
and saying, Repent, for the kingdom of Heaven is at hand.
Matthew 4:17
From that time Jesus began to preach and to say, Repent! For the kingdom of Heaven is at hand.
Revelation 1:3
Blessed is the one who reads and hears the Words of this prophecy, and the ones keeping the things written in it, for the time is near.

General references

Matthew 24:23
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 17:23
And they shall say to you, Lo, here! or, behold, there! Do not go away, nor follow.