1 John 2:19

They went out from us, but they were not of us; for if they had been of us, they would have remained with us; but they went out, that they might be made manifest that they are not all of us.

Acts 20:30

And from among yourselves will men arise speaking perverse things, to draw away the disciples after them.

1 Corinthians 11:19

for there must be also parties among you, that they who are approved may also become manifest among you.

Matthew 13:20-21

And what was sown on the rocky places, this is he that heareth the word, and immediately receiveth it with joy,

Matthew 24:24

For there will rise up false Christs, and false prophets, and will show great signs and wonders, so that, if possible, even the chosen will be deceived.

Mark 4:5-6

And others fell on rocky ground, where they had not much earth; and they sprung up immediately, because they had no depth of earth.

Mark 4:16-17

And these in like manner are they that are sown on the rocky places, those, who, when they have heard the word, immediately receive it with joy,

Mark 13:22

For false Christs and false prophets will rise up, and will do signs and wonders, to lead astray, if possible, the chosen.

Luke 8:13

Those on the rocky ground are they who, when they hear, receive the word with joy; and these have no root; and for a while they believe, and in time of temptation fall away.

John 4:14

but whoever drinketh of the water that I will give him, will never thirst; but the water that I will give him will become within him a well of water springing up to everlasting life.

John 6:37-39

All that the Father giveth me will come to me; and him that cometh to me I will in no wise cast out;

John 10:28-30

and I give them everlasting life; and they shall never perish, nor shall any one tear them out of my hand.

John 15:2

Every branch in me that beareth not fruit he taketh away; and every branch that beareth fruit he cleanseth, that it may bear more fruit.

Acts 15:24

Whereas we have heard, that some who went out from us have troubled you with words, subverting your souls, to whom we gave no command;

Romans 9:6

Not as though the word of God hath failed; for not all they that are of Israel are Israel;

Romans 11:5-6

In the same way then at this present time also there is a remnant, according to the election of grace.

2 Timothy 2:10

For this cause I endure all things for the sake of the elect, that they may also obtain the salvation which is in Christ Jesus, with everlasting glory.

2 Timothy 2:19

Nevertheless Gods firm foundation standeth, having this seal, "The Lord knoweth them that are his;" and, "Let every one that nameth the name of the Lord depart from iniquity."

2 Timothy 3:9

But they will proceed no further; for their folly will be clearly manifest to all, as that of those men was.

Hebrews 10:39

But we are not of those who draw back, unto perdition; but of those who believe, to the saving of the soul.

1 Peter 1:2-5

chosen according to the foreknowledge of God the Father, in sanctification of the Spirit, unto obedience and sprinkling of the blood of Jesus Christ: Grace and peace be multiplied to you.

2 Peter 2:20-21

For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein and overcome, the last state is worse with them than the first.

Jude 1:1

Jude, a servant of Jesus Christ, and brother of James, to the called, loved in God the Father and kept by Jesus Christ:

Jude 1:19

These are they that separate themselves, sensual, not having the Spirit.

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
And what was sown on the rocky places, this is he that heareth the word, and immediately receiveth it with joy,
Mark 4:5
And others fell on rocky ground, where they had not much earth; and they sprung up immediately, because they had no depth of earth.
Luke 8:13
Those on the rocky ground are they who, when they hear, receive the word with joy; and these have no root; and for a while they believe, and in time of temptation fall away.
John 15:2
Every branch in me that beareth not fruit he taketh away; and every branch that beareth fruit he cleanseth, that it may bear more fruit.
Acts 15:24
Whereas we have heard, that some who went out from us have troubled you with words, subverting your souls, to whom we gave no command;
Acts 20:30
And from among yourselves will men arise speaking perverse things, to draw away the disciples after them.
2 Peter 2:20
For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein and overcome, the last state is worse with them than the first.
Jude 1:19
These are they that separate themselves, sensual, not having the Spirit.

They might

Romans 9:6
Not as though the word of God hath failed; for not all they that are of Israel are Israel;
Romans 11:5
In the same way then at this present time also there is a remnant, according to the election of grace.
1 Corinthians 11:19
for there must be also parties among you, that they who are approved may also become manifest among you.
2 Timothy 3:9
But they will proceed no further; for their folly will be clearly manifest to all, as that of those men was.
Hebrews 10:39
But we are not of those who draw back, unto perdition; but of those who believe, to the saving of the soul.

General references

Matthew 25:2
And five of them were foolish, and five wise.
John 10:5
But a stranger they will not follow, but will flee from him; because they know not the voice of strangers.
1 Timothy 5:15
For some have already turned aside after Satan.