Luke 21:8

And He said, "Take heed that ye be not led astray; for many will come in My name, saying, 'I am He,' and, 'The season has drawn near!' Go not after them.

Matthew 3:2

saying, "Repent ye for the Kingdom of Heaven has drawn near;

Matthew 4:17

From that time Jesus began to preach, and to say, "Repent ye; for the Kingdom of Heaven has drawn near."

Ephesians 5:6

Let no one deceive you with empty words; for, because of these things, comes the wrath of God upon the sons of disobedience.

2 Thessalonians 2:3

Let no one deceive you in any manner; because that day will not come, unless the falling away come first, and the man of lawlessness be revealed??he son of perdition;

Matthew 24:4-5

And Jesus, answering, said to them, "Take heed that no one lead you astray;

Matthew 24:11

and many false prophets will arise, and will lead many astray;

Matthew 24:23-25

Then, if any one shall say to you, 'Behold, here is the Christ!' or 'Here,' believe it not;

Mark 13:5-6

And Jesus began to say to them, "Take heed, lest some one lead you astray.

Mark 13:21-23

And then, if any one shall say to you, 'Lo, here is the Christ!' or, 'Lo, there!' believe him not;

Luke 17:23

And they will say to you, 'Lo, there!' or "Lo, here!' go not away, nor follow after them.

John 5:43

I have come in My Father's name, and ye receive Me not; if another shall come in his own name, him ye will receive.

John 8:24

I said, therefore, to you, that ye will die in your sins; for, unless ye believe that I am He, ye will die in your sins."

Acts 5:36-37

for before these days arose Theudas, alleging that he himself was somebody, to whom a number of men, about four hundred, joined themselves; who was slain, and all, as many as obeyed him, were disbanded, and came to nothing.

Acts 8:9-10

But a certain man, Simon by name, was in the city before, using sorcery, and astonishing the nation of Samaria, affirming himself to be some great one;

2 Corinthians 11:13-15

For such men are false apostles, deceitful workers, transforming themselves into apostles of Christ;

2 Thessalonians 2:9-11

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

2 Timothy 3:13

But evil men and imposters will grow worse and worse, deceiving and being deceived.

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 John 1:7

Because many deceivers went out into the world, who confess not Jesus Christ as coming in flesh. This is the deceiver and the Anti-Christ.

Revelation 1:3

Happy is he that reads, and those who hear the words of the prophecy, and keep the things written therein; for the time is near.

Revelation 12:9

And the great dragon was cast down, the old serpent, he that is called the Devil and Satan, who deceives the whole habitable earth; he was cast down to the earth, and his angels were cast down 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 ye receive Me not; if another shall come in his own name, him ye will receive.
Acts 5:36
for before these days arose Theudas, alleging that he himself was somebody, to whom a number of men, about four hundred, joined themselves; who was slain, and all, as many as obeyed him, were disbanded, and came to nothing.
Acts 8:9
But a certain man, Simon by name, was in the city before, using sorcery, and astonishing the nation of Samaria, affirming himself to be some great one;

And the time

Matthew 3:2
saying, "Repent ye for the Kingdom of Heaven has drawn near;
Matthew 4:17
From that time Jesus began to preach, and to say, "Repent ye; for the Kingdom of Heaven has drawn near."
Revelation 1:3
Happy is he that reads, and those who hear the words of the prophecy, and keep the things written therein; for the time is near.

General references

Matthew 24:23
Then, if any one shall say to you, 'Behold, here is the Christ!' or 'Here,' believe it not;
Mark 13:21
And then, if any one shall say to you, 'Lo, here is the Christ!' or, 'Lo, there!' believe him not;
Luke 17:23
And they will say to you, 'Lo, there!' or "Lo, here!' go not away, nor follow after them.