Deuteronomy 11:16

Guard yourselves! Your heart could be deceived. You could turn away and serve other gods and worship them.

Job 31:27

and my heart has been secretly enticed, and my mouth has kissed my hand,

Deuteronomy 8:19

I warn you: 'If you forget Jehovah your God and worship other gods, you will perish.'

Deuteronomy 29:18

Make sure that no man, woman, family, or tribe standing here today turns from Jehovah our God to serve the gods of other nations. This would be like a root that grows to be a bitter and poisonous plant.

Hebrews 2:1

Pay close attention to the things heard so we do not drift away.

Hebrews 3:12

Be careful, brothers and sisters, that none of you develop a wicked heart lacking faith and turning away (departing) from the living God.

Deuteronomy 4:9

Be on your guard! Make sure you do not forget, as long as you live, what you have seen with your own eyes. Teach them to your children and your grandchildren.

Deuteronomy 4:23

Take care of yourselves. Do not forget the covenant of Jehovah your God, which he made with you. Do not make a graven image, or the likeness of anything, which Jehovah your God has forbidden.

Deuteronomy 13:3

do not listen to them. Jehovah your God is allowing them to test you. He will then know that you love Jehovah with all your heart.

Deuteronomy 30:17

If your hearts turn away, and you do not listen, you might be tempted to bow down to other gods and worship them.

Isaiah 44:20

They eat ashes because they are deceived. Their own misguided minds lead them astray. They cannot rescue themselves or ask themselves: Is what I hold in my right hand a false god?

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.

Luke 21:34

Be awake so your hearts are not weighed down. Do not allow the weight of worldly involvement, drunkenness, and cares of this life be a snare when that day suddenly comes.

Luke 21:36

Be on the watch all the time. Pray for the strength to escape all these things in order to stand before the Son of man.

Hebrews 4:1

While the promise of entering his rest remains, let us fear that one of you might come up short and not enter.

Hebrews 12:15

See that no one misses the grace of God; that no bitter root spring up to cause trouble and defile many.

James 1:26

If any man thinks he is religious, while he does not control his tongue but deceives his heart, this man's religion is vain (worthless) (useless).

1 John 5:21

My little children guard (protect) yourselves from idols.

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.

Revelation 13:14

And he deceives those who dwell on the earth by the means of those miracles he had power to do in the sight of the beast. He says to those who dwell on the earth, that they should make an image to the beast that had the wound by a sword and yet lives.

Revelation 20:4

I saw thrones, and they sat on them, and judgment was given to them. I also saw the people who were beheaded for the witness of Jesus, and for the word of God. They had not worshiped the beast or his image. They had not received his mark upon their foreheads, or in their hands. 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
Be on your guard! Make sure you do not forget, as long as you live, what you have seen with your own eyes. Teach them to your children and your grandchildren.
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.
Hebrews 2:1
Pay close attention to the things heard so we do not drift away.
Hebrews 3:12
Be careful, brothers and sisters, that none of you develop a wicked heart lacking faith and turning away (departing) from the living God.
Hebrews 4:1
While the promise of entering his rest remains, let us fear that one of you might come up short and not enter.
Hebrews 12:15
See that no one misses the grace of God; that no bitter root spring up to cause trouble and defile many.

Your heart

Deuteronomy 13:3
do not listen to them. Jehovah your God is allowing them to test you. He will then know that you love Jehovah with all your heart.
Deuteronomy 29:18
Make sure that no man, woman, family, or tribe standing here today turns from Jehovah our God to serve the gods of other nations. This would be like a root that grows to be a bitter and poisonous plant.
Job 31:27
and my heart has been secretly enticed, and my mouth has kissed my hand,
Isaiah 44:20
They eat ashes because they are deceived. Their own misguided minds lead them astray. They cannot rescue themselves or ask themselves: Is what I hold in my right hand a false god?
James 1:26
If any man thinks he is religious, while he does not control his tongue but deceives his heart, this man's religion is vain (worthless) (useless).
1 John 5:21
My little children guard (protect) yourselves from idols.
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.
Revelation 13:14
And he deceives those who dwell on the earth by the means of those miracles he had power to do in the sight of the beast. He says to those who dwell on the earth, that they should make an image to the beast that had the wound by a sword and yet lives.
Revelation 20:4
I saw thrones, and they sat on them, and judgment was given to them. I also saw the people who were beheaded for the witness of Jesus, and for the word of God. They had not worshiped the beast or his image. They had not received his mark upon their foreheads, or in their hands. They lived and reigned with Christ a thousand years.

And serve

Deuteronomy 8:19
I warn you: 'If you forget Jehovah your God and worship other gods, you will perish.'
Deuteronomy 30:17
If your hearts turn away, and you do not listen, you might be tempted to bow down to other gods and worship them.