Matt 7:15-23 (NIV)
"Watch out for false prophets. They come to you in sheep's
clothing, but inwardly they are ferocious wolves. 16 By
their fruit you will recognize them. Do people pick
grapes from thornbushes, or figs from thistles? 17 Likewise
every good tree bears good fruit, but a bad tree
bears bad fruitÉ.21 "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. 22 Many will
say to me on that day, `Lord, Lord, did we not prophesy
in your name, and in your name drive out demons and
perform many miracles?' 23 Then I will tell them
plainly, `I never knew you. Away from me, you evildoers!'