A consecrated oil used in the administration of certain sacraments and ecclesiastical functions. Also there are Oils of different Saints, and Christians use it in their food, or use it when there is any pain in the body etc...
Going to the Church Mar Elias in Niha, Zahle, we were very welcomed, a very gentle woman explained us many things about the church and about Christianity. She also put the oil in my forehead even knowing that I am a muslim, also she did the sign of the cross in my head and also offered us the communion Bread and we shared it.
Here we were in the Church Mar Elias, a Rome Ortodox Church.