Hebrews 6:4-6

Moffatt(i) 4 For in the case of people who have been once enlightened, who tasted the heavenly Gift, who participated in the holy Spirit, 5 who tasted the goodness of God's word and the powers of the world to come, and then fell away — 6 it is impossible to make them repent afresh, since they crucify the Son of God in their own persons and hold him up to obloquy.