'Be Holy' in the Bible

All the days of the vow of his separation there shall no rasor 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.

That ye may remember, and do all my commandments, and be holy unto your God.

In the most holy place shalt thou eat it; every male shall eat it: it shall be holy unto thee.