Bible Verses About Shaving

"'Throughout the period of his vow as a nazir, he is not to shave his head. Until the end of the time for which he has consecrated himself to ADONAI he is to be holy: he is to let the hair on his head grow long.

For indeed you will conceive and bear a son. No razor is to touch his head, because the child will be a nazir for God from the womb. Moreover, he will begin to rescue Isra'el from the power of the P'lishtim."

They are not to shave their heads or let their hair grow long, but must keep their hair carefully trimmed.