Hebrews 2:1

We ought therefore to attend the more to the things which we heard, lest at any time we should glide away [from them].

Hebrews 3:12

See, brothers, that there be not at any time in any one of you an evil mind of unbelief in departing from the living God;

Luke 21:8

And he said, See that you be not deceived; for many shall come in my name, saying, I am [Christ], and the time is at hand; go not after them.

Luke 21:34

Take heed to yourselves, that your hearts be not oppressed with revelling and drunkenness, and worldly cares, and that day come upon you suddenly;

Luke 21:36

But watch continually, praying that you may be accounted worthy to escape all these things which are about to occur, and to stand before the Son of man.

Hebrews 4:1

Let us fear, therefore, lest at any time a promise being left us of entering into his rest, any one of you should seem to come short.

Hebrews 12:15

taking care that no one may come short of the grace of God, that no root of bitterness springing up may make trouble and by it many be defiled,

James 1:26

But if any one among you thinks he is religious, and bridles not his tongue, but deceives his mind, that man's religion is vain.

1 John 5:21

Little children, keep yourselves from idols.

Revelation 12:9

And the great dragon, the old serpent, who is called the devil and Satan, and who deceives all the world, was cast to the earth, and his angels were cast [to the earth] with him.

Revelation 13:14

And he deceives those that dwell on the earth by the miracles which it was given him to perform before the beast, telling those that dwell on the earth to make an image of the beast which had the wound with the sword and lived.

Revelation 20:4

And I saw thrones, and they sat on them, and judgment was given them, and the souls of those who have been beheaded for the testimony of Jesus and the word of God, and who did not worship the beast nor his image and did not receive the mark on their forehead and on their right hand; and they lived and reigned with Christ a thousand years;

Treasury of Scripture Knowledge

Summary

Take heed to yourselves, that your heart be not deceived, and ye turn aside, and serve other gods, and worship them;

Bible References

Take heed

Luke 21:8
And he said, See that you be not deceived; for many shall come in my name, saying, I am [Christ], and the time is at hand; go not after them.
Hebrews 2:1
We ought therefore to attend the more to the things which we heard, lest at any time we should glide away [from them].
Hebrews 3:12
See, brothers, that there be not at any time in any one of you an evil mind of unbelief in departing from the living God;
Hebrews 4:1
Let us fear, therefore, lest at any time a promise being left us of entering into his rest, any one of you should seem to come short.
Hebrews 12:15
taking care that no one may come short of the grace of God, that no root of bitterness springing up may make trouble and by it many be defiled,

Your heart

James 1:26
But if any one among you thinks he is religious, and bridles not his tongue, but deceives his mind, that man's religion is vain.
1 John 5:21
Little children, keep yourselves from idols.
Revelation 12:9
And the great dragon, the old serpent, who is called the devil and Satan, and who deceives all the world, was cast to the earth, and his angels were cast [to the earth] with him.
Revelation 13:14
And he deceives those that dwell on the earth by the miracles which it was given him to perform before the beast, telling those that dwell on the earth to make an image of the beast which had the wound with the sword and lived.
Revelation 20:4
And I saw thrones, and they sat on them, and judgment was given them, and the souls of those who have been beheaded for the testimony of Jesus and the word of God, and who did not worship the beast nor his image and did not receive the mark on their forehead and on their right hand; and they lived and reigned with Christ a thousand years;