Deuteronomy 11:16

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

Job 31:27

And my heart has been secretly enticed, or my mouth has kissed my hand:

Deuteronomy 8:19

And it shall be, if you do at all forget the LORD your God, and walk after other gods, and serve them, and worship them, I testify against you this day that you shall surely perish.

Deuteronomy 29:18

Lest there should be among you a man, or woman, or family, or tribe, whose heart turns away this day from the LORD our God, to go and serve the gods of these nations; lest there should be among you a root that bears bitterness or wormwood;

Hebrews 2:1

Therefore we ought to give the more earnest heed to the things which we have heard, lest at any time we should let them slip.

Hebrews 3:12

Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God.

Deuteronomy 4:9

Only take heed to yourself, and keep your soul diligently, lest you forget the things which your eyes have seen, and lest they depart from your heart all the days of your life: but teach them to your sons, and your sons' sons;

Deuteronomy 4:23

Take heed unto yourselves, lest you forget the covenant of the LORD your God, which he made with you, and make you a graven image, or the likeness of anything, which the LORD your God has forbidden you.

Deuteronomy 13:3

You shall not hearken unto the words of that prophet, or that dreamer of dreams: for the LORD your God is testing you, to know whether you love the LORD your God with all your heart and with all your soul.

Deuteronomy 30:17

But if your heart turns away, so that you will not hear, but shall be drawn away, and worship other gods, and serve them;

Isaiah 44:20

He feeds on ashes: a deceived heart has turned him aside, that he cannot deliver his soul, nor say, Is there not a lie in my right hand?

Luke 21:8

And he said, Take heed that you be not deceived: for many shall come in my name, saying, I am Christ; and the time draws near: go not therefore after them.

Luke 21:34

And take heed to yourselves, lest at any time your hearts be weighed down with carousing, and drunkenness, and cares of this life, and so that day come upon you unawares.

Luke 21:36

Watch therefore, and pray always, that you may be accounted worthy to escape all these things that shall come to pass, and to stand before the Son of man.

Hebrews 4:1

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

Hebrews 12:15

Looking diligently lest any man fall short of the grace of God; lest any root of bitterness springing up trouble you, and thereby many be defiled;

James 1:26

If any man among you seems to be religious, and bridles not his tongue, but deceives his own heart, this man's religion is vain.

1 John 5:21

Little children, keep yourselves from idols. Amen.

Revelation 12:9

And the great dragon was cast out, that old serpent, called the Devil, and Satan, who deceives the whole world: he was cast out into the earth, and his angels were cast out with him.

Revelation 13:14

And deceives them that dwell on the earth by the means of those miracles which he had power to do in the sight of the beast; saying to them that dwell on the earth, that they should make an image to the beast, that had the wound by a sword, and did live.

Revelation 20:4

And I saw thrones, and they sat upon them, and judgment was given unto them: and I saw the souls of them that were beheaded for the witness of Jesus, and for the word of God, and who had not worshiped the beast, neither his image, neither had received his mark upon their foreheads, or in their hands; 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

Deuteronomy 4:9
Only take heed to yourself, and keep your soul diligently, lest you forget the things which your eyes have seen, and lest they depart from your heart all the days of your life: but teach them to your sons, and your sons' sons;
Luke 21:8
And he said, Take heed that you be not deceived: for many shall come in my name, saying, I am Christ; and the time draws near: go not therefore after them.
Hebrews 2:1
Therefore we ought to give the more earnest heed to the things which we have heard, lest at any time we should let them slip.
Hebrews 3:12
Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God.
Hebrews 4:1
Let us therefore fear, lest, although a promise being left us of entering into his rest, any of you should seem to come short of it.
Hebrews 12:15
Looking diligently lest any man fall short of the grace of God; lest any root of bitterness springing up trouble you, and thereby many be defiled;

Your heart

Deuteronomy 13:3
You shall not hearken unto the words of that prophet, or that dreamer of dreams: for the LORD your God is testing you, to know whether you love the LORD your God with all your heart and with all your soul.
Deuteronomy 29:18
Lest there should be among you a man, or woman, or family, or tribe, whose heart turns away this day from the LORD our God, to go and serve the gods of these nations; lest there should be among you a root that bears bitterness or wormwood;
Job 31:27
And my heart has been secretly enticed, or my mouth has kissed my hand:
Isaiah 44:20
He feeds on ashes: a deceived heart has turned him aside, that he cannot deliver his soul, nor say, Is there not a lie in my right hand?
James 1:26
If any man among you seems to be religious, and bridles not his tongue, but deceives his own heart, this man's religion is vain.
1 John 5:21
Little children, keep yourselves from idols. Amen.
Revelation 12:9
And the great dragon was cast out, that old serpent, called the Devil, and Satan, who deceives the whole world: he was cast out into the earth, and his angels were cast out with him.
Revelation 13:14
And deceives them that dwell on the earth by the means of those miracles which he had power to do in the sight of the beast; saying to them that dwell on the earth, that they should make an image to the beast, that had the wound by a sword, and did live.
Revelation 20:4
And I saw thrones, and they sat upon them, and judgment was given unto them: and I saw the souls of them that were beheaded for the witness of Jesus, and for the word of God, and who had not worshiped the beast, neither his image, neither had received his mark upon their foreheads, or in their hands; and they lived and reigned with Christ a thousand years.

And serve

Deuteronomy 8:19
And it shall be, if you do at all forget the LORD your God, and walk after other gods, and serve them, and worship them, I testify against you this day that you shall surely perish.
Deuteronomy 30:17
But if your heart turns away, so that you will not hear, but shall be drawn away, and worship other gods, and serve them;