1 Thessalonians 5:24

He who calls you is faithful, and he will do it.

1 John 4:1-3

Beloved, do not believe every spirit, but test the spirits to see whether they are of God; because many false prophets have gone out into the world.

Revelation 2:2

I know your works, your toil and your patient endurance. I know that you cannot bear evil men, but you have tested those who call themselves apostles and are not, and have found them to be 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
He who calls you is faithful, and he will do it.
1 John 4:1
Beloved, do not believe every spirit, but test the spirits to see whether they are of God; because many false prophets have gone out into the world.
Revelation 2:2
I know your works, your toil and your patient endurance. I know that you cannot bear evil men, but you have tested those who call themselves apostles and are not, and have found them to be false;