Luke 21:8

He said: Take heed that you are not led astray. Many will come in my name, saying, I am he but the time is not at hand. Do not follow them.

Jeremiah 29:8

This is what Jehovah of Hosts, the God of Israel, says: 'Do not let the prophets or the mediums among you trick you. Do not even listen to your own dreams.

Matthew 3:2

Repent, for the kingdom of heaven has come near.

Matthew 4:17

From that time on Jesus preached this message: Repent for the Kingdom of heaven is near.

Ephesians 5:6

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

2 Thessalonians 2:3

Do not let anyone deceive you about this in any way. That day will not come unless apostasy (a falling away from truth) takes place first, and the man of lawlessness (sin), the man of destruction, is revealed. (2 Timothy 4:3)

Matthew 24:4-5

Jesus answered: Be careful that no man misleads you.

Matthew 24:11

Many false prophets will arise and lead many astray.

Matthew 24:23-25

If someone says, 'Here is the Christ,' or, 'Over there is the Christ,' do not believe it.

Mark 13:5-6

Jesus warned them: Take heed that no man lead you astray.

Mark 13:21-23

If any man will say to you here is the Christ or there is the Christ do not believe it.

Luke 17:23

They will tell you go here or go there, but do not follow them.

John 5:43

I came in my Father's name and you did not receive me. If another came in his own name you would receive him.

John 8:24

I said to you that you would die in your sins. Unless you believe that I am he, you will die in your sins!

Acts 5:36-37

Sometime ago Theudas claimed to be somebody. About four hundred men joined and obeyed him. He was killed and they finally dispersed.

Acts 8:9-10

A certain man called Simon was in the same city. He used sorcery, and bewitched the people of Samaria, telling everyone that he was great.

2 Corinthians 11:13-15

For such men are false apostles, deceitful workers, fashioning themselves into apostles of Christ.

2 Thessalonians 2:9-11

The evil (lawless) one will come with the power of Satan and perform all kinds of false signs and wonders.

2 Timothy 3:13

But evil men and impostors will become worse and worse, deceiving and being deceived.

1 John 4:1

Beloved, do not believe every spirit. Test the spirits to see whether they are from God. This is because many false prophets have gone out into the world.

2 John 1:7

For many deceivers have gone into the world. They do not confess that Jesus Christ came in the flesh. This is the deceiver and the antichrist.

Revelation 1:3

Happy is he who reads, and those who hear the words of the prophecy, and obey the things written in it: for the time is near.

Revelation 12:9

The great dragon was thrown down, that old serpent, called the Devil, and Satan, who deceives the whole world. He was hurled down to the earth, and his angels 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 came in my Father's name and you did not receive me. If another came in his own name you would receive him.
Acts 5:36
Sometime ago Theudas claimed to be somebody. About four hundred men joined and obeyed him. He was killed and they finally dispersed.
Acts 8:9
A certain man called Simon was in the same city. He used sorcery, and bewitched the people of Samaria, telling everyone that he was great.

And the time

Matthew 3:2
Repent, for the kingdom of heaven has come near.
Matthew 4:17
From that time on Jesus preached this message: Repent for the Kingdom of heaven is near.
Revelation 1:3
Happy is he who reads, and those who hear the words of the prophecy, and obey the things written in it: for the time is near.

General references

Matthew 24:23
If someone says, 'Here is the Christ,' or, 'Over there is the Christ,' do not believe it.
Mark 13:21
If any man will say to you here is the Christ or there is the Christ do not believe it.
Luke 17:23
They will tell you go here or go there, but do not follow them.