Leviticus 13:34
And the priest shall examine the diseased area of skin on the seventh day, and {if} the diseased area has not spread on the skin and its appearance is not deeper than the skin, then the priest shall pronounce him clean, and he shall wash his garments, and he shall be clean.
1 John 4:1
Dear friends, do not believe every spirit, but test the spirits [to determine] if they are from God, because many false prophets have gone out into the world.
Jude 1:22
And have mercy on those who doubt,
Revelation 2:2
'I know your works, and your labor and patient endurance, and that you are not able to tolerate evil, and you put to the test those who call themselves apostles and are not, and you found them [to be] false.