CHABAD.ORG Pure Oil By Chaya Shuchat

It looked the same, smelled the same, tasted the same. There was nothing in that little jar of oil to distinguish it from any other pure grade, virgin olive oil. The only distinct thing about it was the seal of the high priest, signifying that it was ritually pure. But the Jews insisted on using only the ritually pure oil, and no other, to light the menorah in the Holy Temple, thus precipitating the renowned miracle of Chanukah.