Deuteronomy 11:16

But take care that your hearts are not turned to false ways so that you become servants and worshippers of other gods;

Job 31:27

A secret feeling of worship came into my heart, and my hand gave kisses from my mouth;

Deuteronomy 8:19

And it is certain that if at any time you are turned away from the Lord your God, and go after other gods, to be their servants and to give them worship, destruction will overtake you.

Deuteronomy 29:18

So that there may not be among you any man or woman or family or tribe whose heart is turned away from the Lord our God today, to go after other gods and give them worship; or any root among you whose fruit is poison and bitter sorrow;

Hebrews 2:1

For this reason there is the more need for us to give attention to the things which have come to our ears, for fear that by chance we might be slipping away.

Hebrews 3:12

My brothers, take care that there is not by chance in any one of you an evil heart without belief, turning away from the living God:

Deuteronomy 4:9

Only take care, and keep watch on your soul, for fear that the things which your eyes have seen go from your memory and from your heart all the days of your life; but let the knowledge of them be given to your children and to your children's children;

Deuteronomy 4:23

Take care that you do not let the agreement of the Lord your God, which he has made with you, go out of your mind, or make for yourselves images of any sort, against the orders which the Lord your God has given you.

Deuteronomy 13:3

Then give no attention to the words of that prophet or that dreamer of dreams: for the Lord your God is testing you, to see if all the love of your heart and soul is given to him.

Deuteronomy 30:17

But if your heart is turned away and your ear is shut, and you go after those who would make you servants and worshippers of other gods:

Isaiah 44:20

As for him whose food is the dust of a dead fire, he has been turned from the way by a twisted mind, so that he is unable to keep himself safe by saying, What I have here in my hand is false.

Luke 21:8

And he said, Take care that you are not tricked: for a number of people will come in my name, saying, I am he; and, The time is near: do not go after them.

Luke 21:34

But give attention to yourselves, for fear that your hearts become over-full of the pleasures of food and wine, and the cares of this life, and that day may come on you suddenly, and take you as in a net:

Luke 21:36

But keep watch at all times with prayer, that you may be strong enough to come through all these things and take your place before the Son of man.

Hebrews 4:1

Let us then, though we still have God's word that we may come into his rest, go in fear that some of you may be unable to do so.

Hebrews 12:15

Looking with care to see that no man among you in his behaviour comes short of the grace of God; for fear that some bitter root may come up to be a trouble to you, and that some of you may be made unclean by it;

James 1:26

If a man seems to have religion and has no control over his tongue but lets himself be tricked by what is false, this man's religion is of no value.

1 John 5:21

My little children, keep yourselves from false gods.

Revelation 12:9

And the great dragon was forced down, the old snake, who is named the Evil One and Satan, by whom all the earth is turned from the right way; he was forced down to the earth, and his angels were forced down with him.

Revelation 13:14

And those who are on the earth are turned from the true way by him through the signs which he was given power to do before the beast; giving orders to those who are on the earth to make an image to the beast, who was wounded by the sword, and came to life.

Revelation 20:4

And I saw high seats, and they were seated on them, and the right of judging was given to them: and I saw the souls of those who were put to death for the witness of Jesus, and for the word of God, and those who did not give worship to the beast, or to his image, and had not his mark on their brows or on their hands; and they were living and ruling 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 care, and keep watch on your soul, for fear that the things which your eyes have seen go from your memory and from your heart all the days of your life; but let the knowledge of them be given to your children and to your children's children;
Luke 21:8
And he said, Take care that you are not tricked: for a number of people will come in my name, saying, I am he; and, The time is near: do not go after them.
Hebrews 2:1
For this reason there is the more need for us to give attention to the things which have come to our ears, for fear that by chance we might be slipping away.
Hebrews 3:12
My brothers, take care that there is not by chance in any one of you an evil heart without belief, turning away from the living God:
Hebrews 4:1
Let us then, though we still have God's word that we may come into his rest, go in fear that some of you may be unable to do so.
Hebrews 12:15
Looking with care to see that no man among you in his behaviour comes short of the grace of God; for fear that some bitter root may come up to be a trouble to you, and that some of you may be made unclean by it;

Your heart

Deuteronomy 13:3
Then give no attention to the words of that prophet or that dreamer of dreams: for the Lord your God is testing you, to see if all the love of your heart and soul is given to him.
Deuteronomy 29:18
So that there may not be among you any man or woman or family or tribe whose heart is turned away from the Lord our God today, to go after other gods and give them worship; or any root among you whose fruit is poison and bitter sorrow;
Job 31:27
A secret feeling of worship came into my heart, and my hand gave kisses from my mouth;
Isaiah 44:20
As for him whose food is the dust of a dead fire, he has been turned from the way by a twisted mind, so that he is unable to keep himself safe by saying, What I have here in my hand is false.
James 1:26
If a man seems to have religion and has no control over his tongue but lets himself be tricked by what is false, this man's religion is of no value.
1 John 5:21
My little children, keep yourselves from false gods.
Revelation 12:9
And the great dragon was forced down, the old snake, who is named the Evil One and Satan, by whom all the earth is turned from the right way; he was forced down to the earth, and his angels were forced down with him.
Revelation 13:14
And those who are on the earth are turned from the true way by him through the signs which he was given power to do before the beast; giving orders to those who are on the earth to make an image to the beast, who was wounded by the sword, and came to life.
Revelation 20:4
And I saw high seats, and they were seated on them, and the right of judging was given to them: and I saw the souls of those who were put to death for the witness of Jesus, and for the word of God, and those who did not give worship to the beast, or to his image, and had not his mark on their brows or on their hands; and they were living and ruling with Christ a thousand years.

And serve

Deuteronomy 8:19
And it is certain that if at any time you are turned away from the Lord your God, and go after other gods, to be their servants and to give them worship, destruction will overtake you.
Deuteronomy 30:17
But if your heart is turned away and your ear is shut, and you go after those who would make you servants and worshippers of other gods:

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain