1 John 2:19

From us, it is true, they went out, but they had never belonged to us; for, if they had belonged to us, they would have remained among us. They left us that it might be made clear that they do not, any of them, belong to us.

Acts 20:30

And from among yourselves, too, men will arise, who will teach perversions of truth, so as to draw away the disciples after them.

1 Corinthians 11:19

Indeed, there must be actual parties among you, for so only will the men of real worth become known.

Matthew 13:20-21

By the seed which was sown on rocky places is meant the man who hears the Message, and at once accepts it joyfully;

Matthew 24:24

For false Christs and false Prophets will arise, and will display great signs and marvels, so that, were it possible, even God's People would be led astray.

Mark 4:5-6

Some fell on rocky ground, where it had not much soil, and, having no depth of soil, sprang up at once;

Mark 4:16-17

So, too, those meant by the seed sown on the rocky places are the people who, when they have heard the Message, at once accept it joyfully;

Mark 13:22

For false Christs and false Prophets will arise, and display signs and marvels, to lead astray, were it possible, even God's People.

Luke 8:13

By the seed which fell upon the rock are meant those who, as soon as they hear the Message, welcome it joyfully; but they have no root, and believe it only for a time, and, when the time of temptation comes, they draw back.

John 4:14

But whoever once drinks of the water that I will give him shall never thirst any more; but the water that I will give him shall become a spring welling up within him--a source of Immortal Life."

John 6:37-39

All those whom the Father gives me will come to me; and no one who comes to me will I ever turn away.

John 10:28-30

And I give them Immortal Life, and they shall not be lost; nor shall any one snatch them out of my hands.

John 15:2

Any unfruitful branch in me he takes away, and he cleanses every fruitful branch, that it may bear more fruit.

Acts 15:24

As we had heard that some of our number had upset you by their assertions, and unsettled your minds--without instructions from us--

Romans 9:6

Not that God's Word has failed. For it is not all who are descended from Israel who are true Israelites;

Romans 11:5-6

And so in our own time, too, there is to be found a remnant of our nation selected by God in love.

2 Timothy 2:10

and that is why I submit to anything for the sake of God's People, that they also may obtain the Salvation which comes from union with Christ Jesus, and imperishable glory.

2 Timothy 2:19

Yet God's firm foundation still stands unmoved, and it bears this inscription-- 'THE LORD KNOWS THOSE WHO ARE HIS'; and this-- 'LET ALL THOSE WHO USE THE NAME OF THE LORD TURN AWAY FROM WICKEDNESS.'

2 Timothy 3:9

They will not, however, make further progress; for their wicked folly will be plain to every one, just as that of Jannes and Jambres was.

Hebrews 10:39

But we do not belong to those who draw back, to their Ruin, but to those who have faith, to the saving of their souls.

1 Peter 1:2-5

and who were chosen in accordance with the foreknowledge of God the Father, through the consecration of the Spirit, to learn obedience, and to be purified by the sprinkling of the Blood of Jesus Christ, from Peter, an Apostle of Jesus Christ. May blessing and peace be yours in ever-increasing measure.

2 Peter 2:20-21

If, after having escaped the polluting influences of the world, through knowing our Lord and Savior, Jesus Christ, men are again entangled in them, and give way to them, their last state has become worse than their first.

Jude 1:1

To those who, having received the Call, have been loved by God the Father and protected by Jesus Christ, From Jude, a servant of Jesus Christ, and the brother of James.

Jude 1:19

These are the people--animal and unspiritual--who cause divisions.

Treasury of Scripture Knowledge

Summary

They went out from us, but they were not of us; for if they had been of us, they would no doubt have continued with us: but they went out, that they might be made manifest that they were not all of us.

Bible References

Went out

Matthew 13:20
By the seed which was sown on rocky places is meant the man who hears the Message, and at once accepts it joyfully;
Mark 4:5
Some fell on rocky ground, where it had not much soil, and, having no depth of soil, sprang up at once;
Luke 8:13
By the seed which fell upon the rock are meant those who, as soon as they hear the Message, welcome it joyfully; but they have no root, and believe it only for a time, and, when the time of temptation comes, they draw back.
John 15:2
Any unfruitful branch in me he takes away, and he cleanses every fruitful branch, that it may bear more fruit.
Acts 15:24
As we had heard that some of our number had upset you by their assertions, and unsettled your minds--without instructions from us--
Acts 20:30
And from among yourselves, too, men will arise, who will teach perversions of truth, so as to draw away the disciples after them.
2 Peter 2:20
If, after having escaped the polluting influences of the world, through knowing our Lord and Savior, Jesus Christ, men are again entangled in them, and give way to them, their last state has become worse than their first.
Jude 1:19
These are the people--animal and unspiritual--who cause divisions.

They might

Romans 9:6
Not that God's Word has failed. For it is not all who are descended from Israel who are true Israelites;
Romans 11:5
And so in our own time, too, there is to be found a remnant of our nation selected by God in love.
1 Corinthians 11:19
Indeed, there must be actual parties among you, for so only will the men of real worth become known.
2 Timothy 3:9
They will not, however, make further progress; for their wicked folly will be plain to every one, just as that of Jannes and Jambres was.
Hebrews 10:39
But we do not belong to those who draw back, to their Ruin, but to those who have faith, to the saving of their souls.

General references

Matthew 25:2
Five of them were foolish, and five were prudent.
John 10:5
They will not follow a stranger, but will run away from him; because they do not know a stranger's voice."
1 Timothy 5:15
There are some who have already left us, to follow Satan.