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 were not all of us.

Acts 20:30

and men will arise from among yourselves, speaking perverse things, that they may draw off disciples after them.

1 Corinthians 11:19

for there must be sects among you, that the approved may be made known among you.

Matthew 13:20-21

He that received seed on the stony places is he that hears the word, and immediately receives it with joy.

Matthew 24:24

For false Christs and false prophets will arise, and will show great signs and wonders, so as to deceive, if possible, even the elect.

Mark 4:5-6

Other seed fell on stony ground, where it had not much earth: and it immediately sprung up, because it had no depth of earth.

Mark 4:16-17

And these are they that, in like manner, received seed in stony places: who, when they hear the word, immediately receive it with joy:

Mark 13:22

For false Christs and false prophets will arise, and will show signs and wonders, in order to lead astray, if possible, even the elect.

Luke 8:13

Those on the rock are they that, when they hear, receive the word with joy; and these have no root, who, for awhile, believe, and in time of temptation apostatize.

John 4:14

but whoever drinks of the water that I will give him, shall never thirst. But the water that I will give him, shall be in him a fountain of water springing up in order to eternal life.

John 6:37-39

All that the Father gives me, will come to me; and him that comes to me, I will by no means cast out.

John 10:28-30

and I give them eternal life; and they shall never perish, and no one shall take them out of my hand.

John 15:2

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

Acts 15:24

Inasmuch as we have heard that certain persons went out from us and troubled you with words, subverting your souls, saying, That you must be circumcised, and keep the law, to whom we gave no commandment,

Romans 9:6

It is not possible that the word of God has failed; for they are not all Israel who are of Israel.

Romans 11:5-6

Thus, then, at the present time also, there is a remnant according to the election of grace.

2 Timothy 2:10

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

2 Timothy 2:19

But the foundation of God stands firm, having this inscription: The Lord knows those who are his; and, Let every one that names the name of Christ depart from iniquity.

2 Timothy 3:9

But they shall proceed no further; for their madness shall be manifest to all, as was the madness of those men.

Hebrews 10:39

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

1 Peter 1:2-5

elect according to the foreknowledge of God the Father, by the sanctification of the Spirit, in order to obedience, and sprinkling of the blood of Jesus Christ: grace be to you, and peace be multiplied.

2 Peter 2:20-21

For if, after they have escaped the pollutions of the world, through the knowledge of the Lord and Savior Jesus Christ, they are again entangled in these, and overcome by them, the last state of such is worse than the first.

Jude 1:1

JUDE, a servant of Jesus Christ, and brother of James, to those who are sanctified in God the Father, and preserved in Jesus Christ, and called:

Jude 1:19

These are they who separate themselves, animal, 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
He that received seed on the stony places is he that hears the word, and immediately receives it with joy.
Mark 4:5
Other seed fell on stony ground, where it had not much earth: and it immediately sprung up, because it had no depth of earth.
Luke 8:13
Those on the rock are they that, when they hear, receive the word with joy; and these have no root, who, for awhile, believe, and in time of temptation apostatize.
John 15:2
Every branch in me that bears no fruit, he takes away; and every branch that bears fruit, he prunes, that it may bear more fruit.
Acts 15:24
Inasmuch as we have heard that certain persons went out from us and troubled you with words, subverting your souls, saying, That you must be circumcised, and keep the law, to whom we gave no commandment,
Acts 20:30
and men will arise from among yourselves, speaking perverse things, that they may draw off 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 Savior Jesus Christ, they are again entangled in these, and overcome by them, the last state of such is worse than the first.
Jude 1:19
These are they who separate themselves, animal, not having the Spirit.

They might

Romans 9:6
It is not possible that the word of God has failed; for they are not all Israel who are of Israel.
Romans 11:5
Thus, then, at the present time also, there is a remnant according to the election of grace.
1 Corinthians 11:19
for there must be sects among you, that the approved may be made known among you.
2 Timothy 3:9
But they shall proceed no further; for their madness shall be manifest to all, as was the madness of those men.
Hebrews 10:39
But we are not of those who draw back to perdition; but of those who believe to the saving of the soul.

General references

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