Hebrews 6:4-8

For it is impossible in the case of those who have once been enlightened, tasted the heavenly gift, become partakers of the Holy Spirit, tasted the good word of God and the miracles of the coming age, and then have committed apostasy, to renew them again to repentance, since they are crucifying the Son of God for themselves all over again and holding him up to contempt. For the ground that has soaked up the rain that frequently falls on it and yields useful vegetation for those who tend it receives a blessing from God. But if it produces thorns and thistles, it is useless and about to be cursed; its fate is to be burned.