1 John 2:19

They have gone forth from our midst, but they did not really belong to us; for had they belonged to us, they would have remained with us. But they left us that it might be manifest that professed believers do not all belong to us.

Acts 20:30

and that from among your own selves men will rise up who will seek with their perverse talk to draw away the disciples after them.

1 Corinthians 11:19

For there must of necessity be differences of opinion among you, in order that it may be plainly seen who are the men of sterling worth among you.

Matthew 13:20-21

He who has received the seed on the rocky ground is the man who hears the Message and immediately receives it with joy.

Matthew 24:24

For there will rise up false Christs and false prophets, displaying wonderful signs and prodigies, so as to deceive, were it possible, even God's own People.

Mark 4:5-6

Some falls on the rocky ground where it finds but little earth, and it shoots up quickly because it has no depth of soil;

Mark 4:16-17

In the same way those who receive the seed on the rocky places are those who, when they have heard the Message, at once accept it joyfully,

Mark 13:22

For there will rise up false Christs and false prophets, displaying signs and prodigies with a view to lead astray--if indeed that were possible--even God's own People.

Luke 8:13

Those on the rock are the people who on hearing the Message receive it joyfully; but they have no root: for a time they believe, but when trial comes they fall away.

John 4:14

but whoever drinks any of the water that I shall give him will never, never thirst. But the water that I shall give him will become a fountain within him of water springing up for the Life of the Ages."

John 6:37-39

Every one whom the Father gives me will come to me, and him who comes to me I will never on any account drive away.

John 10:28-30

I give them the Life of the Ages, and they shall never, never perish, nor shall any one wrest them from my hand.

John 15:2

Every branch in me--if it bears no fruit, He takes away; and every branch that bears fruit He prunes, that it may bear more fruit.

Acts 15:24

As we have been informed that certain persons who have gone out from among us have disturbed you by their teaching and have unsettled your minds, without having received any such instructions from us;

Romans 9:6

Not however that God's word has failed; for all who have sprung from Israel do not count as Israel,

Romans 11:5-6

In the same way also at the present time there has come to be a remnant whom God in His grace has selected.

2 Timothy 2:10

For this reason I endure all things for the sake of God's own people; so that they also may obtain salvation--even the salvation which is in Christ Jesus--and with it eternal glory.

2 Timothy 2:19

Yet God's solid foundation stands unmoved, bearing this inscription, "The Lord knows those who really belong to Him." And this also, "Let every one who names the Name of the Lord renounce all wickedness."

2 Timothy 3:9

But they will have no further success; for their folly will be as clearly manifest to all men, as that of the opponents of Moses came to be.

Hebrews 10:39

But we are not people who shrink back and perish, but are among those who believe and gain possession of their souls.

1 Peter 1:2-5

chosen in accordance with the foreknowledge of God the Father, through the sanctifying work of the Spirit, with a view to their obedience and to their being sprinkled with the blood of Jesus Christ. May more and more grace and peace be granted to you.

2 Peter 2:20-21

For if, after escaping from the pollutions of the world through a full knowledge of our Lord and Saviour Jesus Christ, people are once more entangled in these pollutions and are overcome, their last state has become worse than their first.

Jude 1:1

Jude, a bondservant of Jesus Christ and a brother of James: To those who are in God the Father, enfolded in His love, and kept for Jesus Christ, and called.

Jude 1:19

These are those who cause divisions. They are men of the world, wholly unspiritual.

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
He who has received the seed on the rocky ground is the man who hears the Message and immediately receives it with joy.
Mark 4:5
Some falls on the rocky ground where it finds but little earth, and it shoots up quickly because it has no depth of soil;
Luke 8:13
Those on the rock are the people who on hearing the Message receive it joyfully; but they have no root: for a time they believe, but when trial comes they fall away.
John 15:2
Every branch in me--if it bears no fruit, He takes away; and every branch that bears fruit He prunes, that it may bear more fruit.
Acts 15:24
As we have been informed that certain persons who have gone out from among us have disturbed you by their teaching and have unsettled your minds, without having received any such instructions from us;
Acts 20:30
and that from among your own selves men will rise up who will seek with their perverse talk to draw away the disciples after them.
2 Peter 2:20
For if, after escaping from the pollutions of the world through a full knowledge of our Lord and Saviour Jesus Christ, people are once more entangled in these pollutions and are overcome, their last state has become worse than their first.
Jude 1:19
These are those who cause divisions. They are men of the world, wholly unspiritual.

They might

Romans 9:6
Not however that God's word has failed; for all who have sprung from Israel do not count as Israel,
Romans 11:5
In the same way also at the present time there has come to be a remnant whom God in His grace has selected.
1 Corinthians 11:19
For there must of necessity be differences of opinion among you, in order that it may be plainly seen who are the men of sterling worth among you.
2 Timothy 3:9
But they will have no further success; for their folly will be as clearly manifest to all men, as that of the opponents of Moses came to be.
Hebrews 10:39
But we are not people who shrink back and perish, but are among those who believe and gain possession of their souls.

General references

Matthew 25:2
Five of them were foolish and five were wise.
John 10:5
But a stranger they will by no means follow, but will run away from him, because they do not know the voice of strangers."
1 Timothy 5:15
For already some of them have gone astray, following Satan.