Matthew 7:15-18, 20-21

“Beware of the false prophets, [teachers] who come to you dressed as sheep [appearing gentle and innocent], but inwardly are ravenous wolves. [Ezek 22:27] By their fruit you will recognize them [that is, by their contrived doctrine and self-focus]. Do people pick grapes from thorn bushes or figs from thistles? [Luke 6:43, 44] Even so, every healthy tree bears good fruit, but the unhealthy tree bears bad fruit. A good tree cannot bear bad fruit, nor can a bad tree bear good fruit.

Therefore, by their fruit you will recognize them [as false prophets]. “Not everyone who says to Me, ‘Lord, Lord,’ will enter the kingdom of heaven, but only he who does the will of My Father who is in heaven.