1 Corinthians 11:19

For there must also be factions among you, so that those who are approved may become evident among you.

1 John 2:19

They went out from us, but they were not really of us; for if they had been of us, they would have remained with us; but they went out, so that it would be shown that they all are not of us.

Deuteronomy 13:3

you shall not listen to the words of that prophet or that dreamer of dreams; for the Lord your God is testing you to find out if you love the Lord your God with all your heart and with all your soul.

Matthew 18:7

“Woe to the world because of its stumbling blocks! For it is inevitable that stumbling blocks come; but woe to that man through whom the stumbling block comes!

Luke 17:1

He said to His disciples, It is inevitable that stumbling blocks come, but woe to him through whom they come!

Acts 20:30

and from among your own selves men will arise, speaking perverse things, to draw away the disciples after them.

Titus 3:10

Reject a factious man after a first and second warning,

Luke 2:35

and a sword will pierce even your own soul—to the end that thoughts from many hearts may be revealed.”

Acts 5:17

But the high priest rose up, along with all his associates (that is the sect of the Sadducees), and they were filled with jealousy.

Acts 15:5

But some of the sect of the Pharisees who had believed stood up, saying, “It is necessary to circumcise them and to direct them to observe the Law of Moses.”

Acts 24:5

For we have found this man a real pest and a fellow who stirs up dissension among all the Jews throughout the world, and a ringleader of the sect of the Nazarenes.

Acts 24:14

But this I admit to you, that according to the Way which they call a sect I do serve the God of our fathers, believing everything that is in accordance with the Law and that is written in the Prophets;

Acts 26:5

since they have known about me for a long time, if they are willing to testify, that I lived as a Pharisee according to the strictest sect of our religion.

Acts 28:22

But we desire to hear from you what your views are; for concerning this sect, it is known to us that it is spoken against everywhere.”

2 Corinthians 13:5-7

Test yourselves to see if you are in the faith; examine yourselves! Or do you not recognize this about yourselves, that Jesus Christ is in you—unless indeed you fail the test?

Galatians 5:20

idolatry, sorcery, enmities, strife, jealousy, outbursts of anger, disputes, dissensions, factions,

1 Timothy 4:1-2

But the Spirit explicitly says that in later times some will fall away from the faith, paying attention to deceitful spirits and doctrines of demons,

2 Peter 2:1-2

But false prophets also arose among the people, just as there will also be false teachers among you, who will secretly introduce destructive heresies, even denying the Master who bought them, bringing swift destruction upon themselves.

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 because of its stumbling blocks! For it is inevitable that stumbling blocks come; but woe to that man through whom the stumbling block comes!
Luke 17:1
He said to His disciples, It is inevitable that stumbling blocks come, but woe to him through whom they come!
Acts 20:30
and from among your own selves men will arise, speaking perverse things, to draw away the disciples after them.
1 Timothy 4:1
But the Spirit explicitly says that in later times some will fall away from the faith, paying attention to deceitful spirits and doctrines of demons,
2 Peter 2:1
But false prophets also arose among the people, just as there will also be false teachers among you, who will secretly introduce destructive heresies, even denying the Master who bought them, bringing swift destruction upon themselves.

Which

Deuteronomy 13:3
you shall not listen to the words of that prophet or that dreamer of dreams; for the Lord your God is testing you to find out if you love the Lord your God with all your heart and with all your soul.
Luke 2:35
and a sword will pierce even your own soul—to the end that thoughts from many hearts may be revealed.”
2 Corinthians 13:5
Test yourselves to see if you are in the faith; examine yourselves! Or do you not recognize this about yourselves, that Jesus Christ is in you—unless indeed you fail the test?