For the entire period of his vow of separation, no razor shall pass over his head. He must be holy until the time of his separation to the LORD is complete; he must let the hair of his head grow long.

Acts 18:18
Paul remained in Corinth for quite some time before saying goodbye to the brothers. He had his head shaved in Cenchrea to keep a vow he had made, and then he sailed for Syria, accompanied by Priscilla and Aquila.

Numbers 6:4
All the days of his separation, he is not to eat anything that comes from the grapevine, not even the seeds or skins.

Judges 16:17
Samson told her all that was in his heart: "My hair has never been cut, because I have been a Nazirite to God from my mother's womb. If I am shaved, my strength will leave me, and I will become as weak as any other man."

1 Samuel 1:11
And she made a vow, pleading, "O LORD of Hosts, if only You will look upon the affliction of Your maidservant and remember me, not forgetting Your maidservant but giving her a son, then I will dedicate him to the LORD all the days of his life, and no razor shall ever come over his head."

Ezekiel 44:20
They must not shave their heads or let their hair grow long, but must carefully trim their hair.

All the days of the vow of his separation there shall no razor come on his head: until the days be fulfilled, in the which he separates himself to the LORD, he shall be holy, and shall let the locks of the hair of his head grow.