Matthew 7:16-20

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. Every tree that does not bear good fruit is cut down and thrown into the fire. Therefore, by their fruit you will recognize them [as false prophets].