Hebrews 6:4-6

4It is impossible for those who have once been enlightened, who have tasted the heavenly gift, who have shared in the Holy Spirit, 5who have tasted the goodness of the word of God and the powers of the coming age 6and who have fallen Or age, 6 if they fall away, to be brought back to repentance. To their loss they are crucifying the Son of God all over again and subjecting him to public disgrace.