Deuteronomy 18:21

And if thou say in thy heart, How shall we know the word which LORD has not spoken?

1 Thessalonians 5:24

Faithful is he who calls you, who also will do it.

1 John 4:1-3

Beloved, do not believe every spirit, but examine the spirits, whether they are of God, because many FALSE prophets have gone out into the world.

Revelation 2:2

I know thy works, and thy toil, and thy perseverance, and that thou cannot tolerate evil, and thou examined those who say themselves to be apostles, and are not, and found them false.

Treasury of Scripture Knowledge

Summary

And if thou say in thine heart, How shall we know the word which the LORD hath not spoken?

Bible References

General references

1 Thessalonians 5:24
Faithful is he who calls you, who also will do it.
1 John 4:1
Beloved, do not believe every spirit, but examine the spirits, whether they are of God, because many FALSE prophets have gone out into the world.
Revelation 2:2
I know thy works, and thy toil, and thy perseverance, and that thou cannot tolerate evil, and thou examined those who say themselves to be apostles, and are not, and found them false.