Hebrews 5:12-6:6

12In fact, though by this time you ought to be teachers, you need someone to teach you the elementary truths of God’s word all over again. You need milk, not solid food! 13Anyone who lives on milk, being still an infant, is not acquainted with the teaching about righteousness. 14But solid food is for the mature, who by constant use have trained themselves to distinguish good from evil.

1Therefore let us move beyond the elementary teachings about Christ and be taken forward to maturity, not laying again the foundation of repentance from acts that lead to death, Or from useless rituals and of faith in God, 2instruction about cleansing rites, Or about baptisms the laying on of hands, the resurrection of the dead, and eternal judgment.

3And God permitting, we will do so. 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.