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.

Matthew 3:2

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 one deceive you with vain words; for because of these things the wrath of God cometh upon the sons of disobedience.

2 Thessalonians 2:3

Let no one deceive you in any manner; for [that day will not come] unless the apostasy shall have come first and the man of sin have been revealed, the son of perdition;

Matthew 24:4-5

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

Matthew 24:11

And many false prophets will arise, and will deceive many.

Matthew 24:23-25

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

Mark 13:5-6

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

Mark 13:21-23

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

Luke 17:23

And they will say to you, Lo there! lo here! Go not away, and follow not.

John 5:43

I have come in my Fathers name, and ye receive me not; if another come in his own name, him ye will receive.

John 8:24

Therefore I said 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, boasting himself to be somebody; to whom a number of men, about four hundred, joined themselves: who was slain, and all, as many as obeyed him, were scattered, and came to nought.

Acts 8:9-10

But before their arrival a certain man, named Simon, was in the city, a man practising sorcery, and amazing the people of Samaria, saying that he himself was some great person;

2 Corinthians 11:13-15

For such are false apostles, deceitful workmen, transforming themselves into apostles of Christ.

2 Thessalonians 2:9-11

[he,] whose coming is after the working of Satan with all power, and signs, and wonders of falsehood,

2 Timothy 3:13

But evil men and impostors will wax 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

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 1:3

Blessed is he that readeth, and they that hear the words of the prophecy, and keep the things written therein; for the time is at hand.

Revelation 12:9

And the great dragon was cast down, the old serpent, called the Devil and Satan, who deceiveth the whole world; 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 Fathers name, and ye receive me not; if another come in his own name, him ye will receive.
Acts 5:36
For before these days arose Theudas, boasting himself to be somebody; to whom a number of men, about four hundred, joined themselves: who was slain, and all, as many as obeyed him, were scattered, and came to nought.
Acts 8:9
But before their arrival a certain man, named Simon, was in the city, a man practising sorcery, and amazing the people of Samaria, saying that he himself was some great person;

And the time

Matthew 3:2
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 he that readeth, and they that hear the words of the prophecy, and keep the things written therein; for the time is at hand.

General references

Matthew 24:23
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 17:23
And they will say to you, Lo there! lo here! Go not away, and follow not.