1 John 2:19

They withdrew from us, but they did not belong to us; had they belonged to us, they would have remained with us, but they withdrew to make it plain that they are none of us.

Acts 20:30

and men of your own number will arise with perversions of the truth to draw the disciples after them.

1 Corinthians 11:19

There must be parties among you, if genuine Christians are to be recognized.

Matthew 13:20-21

As for him who is sown 'on stony soil,' that is the man who hears the word and accepts it at once with enthusiasm;

Matthew 24:24

for false Christs and false prophets will rise and bring forward great signs and wonders, so as to mislead the very elect, ??if that were possible.

Mark 4:5-6

some other seed fell on stony soil where it had not much earth, and it shot up at once because it had no depth of earth,

Mark 4:16-17

Similarly those who are sown 'on stony soil' are the people who on hearing the word accept it with enthusiasm;

Mark 13:22

for false Christs and false prophets will rise and perform signs and wonders to mislead the elect if they can.

Luke 8:13

Those 'on the rock' are people who on hearing the word welcome it with enthusiasm, but they have no root; they believe for a while and fall away in the hour of trial.

John 4:14

but anyone who drinks the water I shall give him will never thirst any more; the water I shall give him will turn into a spring of water welling up to eternal life."

John 6:37-39

All those will come to me who are the Father's gift to me, and never will I reject one of them;

John 10:28-30

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

John 15:2

he cuts away any branch on me which is not bearing fruit, and cleans every branch which does bear fruit, to make it bear richer fruit.

Acts 15:24

Having learned that some of our number, quite unauthorized by us, have unsettled you with their teaching and upset your souls,

Romans 9:6

It is not, of course, as if God's word had failed! Far from it! 'Israel' does not mean everyone who belongs to Israel;

Romans 11:5-6

Well, at the present day there is also a remnant, selected by grace.

2 Timothy 2:10

All I endure is for the sake of the elect, to let them obtain their share of the salvation of Christ Jesus and also of eternal glory.

2 Timothy 2:19

But the solid foundation laid by God remains, and this is its inscription: the Lord knows who are his, and 'let everyone who names the name of the Lord give up evil.'

2 Timothy 3:9

However, they will get no further, for their aberration will be detected by everyone, as was the case with these magicians.

Hebrews 10:39

We are not the men to shrink back and be lost, but to have faith and so to win our souls.

1 Peter 1:2-5

whom God the Father has predestined and chosen, by the consecration of the Spirit, to obey Jesus Christ and be sprinkled with his blood: may grace and peace be multiplied to you.

2 Peter 2:20-21

After escaping the pollutions of the world by the knowledge of our Lord and saviour Jesus Christ, if they get entangled and overpowered again, the last state is worse for them than the first.

Jude 1:1

Judas, a servant of Jesus Christ and a brother of James, to those who have been called, who are beloved by God the Father and kept by Jesus Christ:

Jude 1:19

These are the people who set up divisions and distinctions, sensuous creatures, destitute of 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
As for him who is sown 'on stony soil,' that is the man who hears the word and accepts it at once with enthusiasm;
Mark 4:5
some other seed fell on stony soil where it had not much earth, and it shot up at once because it had no depth of earth,
Luke 8:13
Those 'on the rock' are people who on hearing the word welcome it with enthusiasm, but they have no root; they believe for a while and fall away in the hour of trial.
John 15:2
he cuts away any branch on me which is not bearing fruit, and cleans every branch which does bear fruit, to make it bear richer fruit.
Acts 15:24
Having learned that some of our number, quite unauthorized by us, have unsettled you with their teaching and upset your souls,
Acts 20:30
and men of your own number will arise with perversions of the truth to draw the disciples after them.
2 Peter 2:20
After escaping the pollutions of the world by the knowledge of our Lord and saviour Jesus Christ, if they get entangled and overpowered again, the last state is worse for them than the first.
Jude 1:19
These are the people who set up divisions and distinctions, sensuous creatures, destitute of the Spirit.

They might

Romans 9:6
It is not, of course, as if God's word had failed! Far from it! 'Israel' does not mean everyone who belongs to Israel;
Romans 11:5
Well, at the present day there is also a remnant, selected by grace.
1 Corinthians 11:19
There must be parties among you, if genuine Christians are to be recognized.
2 Timothy 3:9
However, they will get no further, for their aberration will be detected by everyone, as was the case with these magicians.
Hebrews 10:39
We are not the men to shrink back and be lost, but to have faith and so to win our souls.

General references

Matthew 25:2
Five of them were stupid and five were sensible.
John 10:5
they will not follow a stranger, they will run from him, because they do not know the voice of strangers."
1 Timothy 5:15
As it is, some widows have already turned after Satan. ??16 Any believer, man or woman, who has widowed relatives, must give them relief; the church is not to be burdened with them; she has to relieve the widows who really need relief.