Hebrews 2:1

Therefore we must pay more careful attention to what we have heard, lest we drift away from it.

Hebrews 3:12

Take care, brethren, lest there be in any one of you an evil, unbelieving heart, leading you to fall away from the living God.

Luke 21:8

And he said: "Take heed that you not are deceived. For many will come in my name, saying, 'I am he,' and, 'The time is near.' Do not go after them.

Luke 21:34

"But take heed to yourselves, lest your hearts be weighed down with dissipation and drunkenness and cares of this life, and that Day come on you unexpectedly like a trap.

Luke 21:36

Watch at all times, and pray always that you may have strength to escape all these things that will take place, and to stand before the Son of Man."

Hebrews 4:1

Therefore, while the promise of entering his rest remains, let us fear lest any one of you be judged to have come short of it.

Hebrews 12:15

See to it that no one comes short of the grace of God; that no root of bitterness spring up and cause trouble, and by it many become defiled;

James 1:26

If anyone thinks himself to be religious, and yet does not bridle his tongue but deceives his own heart, this man's religion is worthless.

1 John 5:21

Little children, keep yourselves from idols.

Revelation 12:9

And the great dragon was thrown down, that ancient serpent, who is called the Devil and Satan, the deceiver of the whole worldhe was thrown down to the earth, and his angels were thrown down with him.

Revelation 13:14

And he deceives those who dwell on the earth because of the signs which he was given power to do in the presence of the beast. He ordered them to make an image in honor of the beast who was wounded by the sword and yet lived.

Revelation 20:4

Then I saw thrones, and seated on them were those to whom judgment was given. Also I saw the souls of those who had been beheaded because of their testimony to Jesus and because of the word of God, and who had not worshipped the beast or his image and had not received its mark on their foreheads or their hands. They came to life, 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: "Take heed that you not are deceived. For many will come in my name, saying, 'I am he,' and, 'The time is near.' Do not go after them.
Hebrews 2:1
Therefore we must pay more careful attention to what we have heard, lest we drift away from it.
Hebrews 3:12
Take care, brethren, lest there be in any one of you an evil, unbelieving heart, leading you to fall away from the living God.
Hebrews 4:1
Therefore, while the promise of entering his rest remains, let us fear lest any one of you be judged to have come short of it.
Hebrews 12:15
See to it that no one comes short of the grace of God; that no root of bitterness spring up and cause trouble, and by it many become defiled;

Your heart

James 1:26
If anyone thinks himself to be religious, and yet does not bridle his tongue but deceives his own heart, this man's religion is worthless.
1 John 5:21
Little children, keep yourselves from idols.
Revelation 12:9
And the great dragon was thrown down, that ancient serpent, who is called the Devil and Satan, the deceiver of the whole worldhe was thrown down to the earth, and his angels were thrown down with him.
Revelation 13:14
And he deceives those who dwell on the earth because of the signs which he was given power to do in the presence of the beast. He ordered them to make an image in honor of the beast who was wounded by the sword and yet lived.
Revelation 20:4
Then I saw thrones, and seated on them were those to whom judgment was given. Also I saw the souls of those who had been beheaded because of their testimony to Jesus and because of the word of God, and who had not worshipped the beast or his image and had not received its mark on their foreheads or their hands. They came to life, and reigned with Christ a thousand years.