1 Corinthians 11:19

for it behoveth sects also to be among you, that those approved may become manifest among you;

1 John 2:19

out of us they went forth, but they were not of us, for if they had been of us, they would have remained with us; but -- that they might be manifested that they are not all of us.

Deuteronomy 13:3

thou dost not hearken unto the words of that prophet, or unto that dreamer of the dream, for Jehovah your God is trying you, to know whether ye are loving Jehovah your God with all your heart, and with all your soul;

Matthew 18:7

'Woe to the world from the stumbling-blocks! for there is a necessity for the stumbling-blocks to come, but woe to that man through whom the stumbling-block doth come!

Luke 17:1

And he said unto the disciples, 'It is impossible for the stumbling blocks not to come, but woe to him through whom they come;

Acts 20:30

and of your own selves there shall arise men, speaking perverse things, to draw away the disciples after them.

Titus 3:10

A sectarian man, after a first and second admonition be rejecting,

Luke 2:35

(and also thine own soul shall a sword pass through) -- that the reasonings of many hearts may be revealed.'

Acts 5:17

And having risen, the chief priest, and all those with him -- being the sect of the Sadducees -- were filled with zeal,

Acts 15:5

and there rose up certain of those of the sect of the Pharisees who believed, saying -- 'It behoveth to circumcise them, to command them also to keep the law of Moses.'

Acts 24:5

for having found this man a pestilence, and moving a dissension to all the Jews through the world -- a ringleader also of the sect of the Nazarenes --

Acts 24:14

'And I confess this to thee, that, according to the way that they call a sect, so serve I the God of the fathers, believing all things that in the law and the prophets have been written,

Acts 26:5

knowing me before from the first, (if they may be willing to testify,) that after the most exact sect of our worship, I lived a Pharisee;

Acts 28:22

and we think it good from thee to hear what thou dost think, for, indeed, concerning this sect it is known to us that everywhere it is spoken against;'

2 Corinthians 13:5-7

Your own selves try ye, if ye are in the faith; your own selves prove ye; do ye not know your own selves, that Jesus Christ is in you, if ye be not in some respect disapproved of?

Galatians 5:20

idolatry, witchcraft, hatred, strifes, emulations, wraths, rivalries, dissensions, sects,

1 Timothy 4:1-2

And the Spirit expressly speaketh, that in latter times shall certain fall away from the faith, giving heed to seducing spirits and teachings of demons,

2 Peter 2:1-2

And there did come also false prophets among the people, as also among you there shall be false teachers, who shall bring in besides destructive sects, and the Master who bought them denying, bringing to themselves quick destruction,

Treasury of Scripture Knowledge

Summary

For there must be also heresies among you, that they which are approved may be made manifest among you.

Bible References

There

Matthew 18:7
'Woe to the world from the stumbling-blocks! for there is a necessity for the stumbling-blocks to come, but woe to that man through whom the stumbling-block doth come!
Luke 17:1
And he said unto the disciples, 'It is impossible for the stumbling blocks not to come, but woe to him through whom they come;
Acts 20:30
and of your own selves there shall arise men, speaking perverse things, to draw away the disciples after them.
1 Timothy 4:1
And the Spirit expressly speaketh, that in latter times shall certain fall away from the faith, giving heed to seducing spirits and teachings of demons,
2 Peter 2:1
And there did come also false prophets among the people, as also among you there shall be false teachers, who shall bring in besides destructive sects, and the Master who bought them denying, bringing to themselves quick destruction,

Which

Deuteronomy 13:3
thou dost not hearken unto the words of that prophet, or unto that dreamer of the dream, for Jehovah your God is trying you, to know whether ye are loving Jehovah your God with all your heart, and with all your soul;
Luke 2:35
(and also thine own soul shall a sword pass through) -- that the reasonings of many hearts may be revealed.'
2 Corinthians 13:5
Your own selves try ye, if ye are in the faith; your own selves prove ye; do ye not know your own selves, that Jesus Christ is in you, if ye be not in some respect disapproved of?