Read Numbers 6:5 Using Other Translations
All the days of the vow of his separation there shall no razor come upon his head: until the days be fulfilled, in the which he separateth himself unto the LORD, he shall be holy, and shall let the locks of the hair of his head grow.
"All the days of his vow of separation, no razor shall touch his head. Until the time is completed for which he separates himself to the LORD, he shall be holy. He shall let the locks of hair of his head grow long.
“They must never cut their hair throughout the time of their vow, for they are holy and set apart to the LORD . Until the time of their vow has been fulfilled, they must let their hair grow long.