Hebrews 2:1

Therefore we must give still more heed to what we were taught, for fear we should drift away.

Hebrews 3:12

Be careful, Brothers, that there is never found in any one of you a wicked and faithless heart, shown by his separating himself from the Living God.

Luke 21:8

And Jesus said: "See that you are not led astray; for many will take my name, and come saying 'I am He,' and 'The time is close at hand.' Do not follow them.

Luke 21:34

Be on your guard lest your minds should ever be dulled by debauches or drunkenness or the anxieties of life, and lest 'That Day' should come suddenly upon you, like a snare.

Luke 21:36

Be on the watch at all times, and pray that you may have strength to escape all that is destined to happen, and to stand in the presence of the Son of Man."

Hebrews 4:1

We must, therefore, be very careful, though there is a promise still standing that we shall enter upon God's Rest, that none of you even appear to have missed it.

Hebrews 12:15

Take care that no one fails to use the loving help of God, 'that no bitterness is allowed to take root and spring up, and cause trouble,' and so poison the whole community.

James 1:26

When a man appears to be religious, yet does not bridle his tongue, but imposes upon his own conscience, that man's religious observances are valueless.

1 John 5:21

My Children, guard yourselves against false ideas of God.

Revelation 12:9

Then the great Dragon, the primeval Serpent, known as the 'Devil' and 'Satan,' who deceives all the world, was hurled down to the earth, and his angels were hurled down with him.

Revelation 13:14

and in consequence of the marvels which it was allowed to perform under the eyes of the Beast, it is able to deceive all who are living on the earth. It bids those who live on the earth to make a statue in honour of the Beast, who, despite the wound from the sword, yet lived.

Revelation 20:4

Then I saw thrones, and to those who took their seats upon them authority was given to act as judges. And I saw the souls of those who had been beheaded because of the testimony to Jesus and because of the Message of God, for they had refused to worship the Beast or its image, and had not received the brand on their foreheads and on their hands. They were restored to life, and they reigned with the Christ for 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 Jesus said: "See that you are not led astray; for many will take my name, and come saying 'I am He,' and 'The time is close at hand.' Do not follow them.
Hebrews 2:1
Therefore we must give still more heed to what we were taught, for fear we should drift away.
Hebrews 3:12
Be careful, Brothers, that there is never found in any one of you a wicked and faithless heart, shown by his separating himself from the Living God.
Hebrews 4:1
We must, therefore, be very careful, though there is a promise still standing that we shall enter upon God's Rest, that none of you even appear to have missed it.
Hebrews 12:15
Take care that no one fails to use the loving help of God, 'that no bitterness is allowed to take root and spring up, and cause trouble,' and so poison the whole community.

Your heart

James 1:26
When a man appears to be religious, yet does not bridle his tongue, but imposes upon his own conscience, that man's religious observances are valueless.
1 John 5:21
My Children, guard yourselves against false ideas of God.
Revelation 12:9
Then the great Dragon, the primeval Serpent, known as the 'Devil' and 'Satan,' who deceives all the world, was hurled down to the earth, and his angels were hurled down with him.
Revelation 13:14
and in consequence of the marvels which it was allowed to perform under the eyes of the Beast, it is able to deceive all who are living on the earth. It bids those who live on the earth to make a statue in honour of the Beast, who, despite the wound from the sword, yet lived.
Revelation 20:4
Then I saw thrones, and to those who took their seats upon them authority was given to act as judges. And I saw the souls of those who had been beheaded because of the testimony to Jesus and because of the Message of God, for they had refused to worship the Beast or its image, and had not received the brand on their foreheads and on their hands. They were restored to life, and they reigned with the Christ for a thousand years.