What are oil vials? Oil vials are generally used by various religions to hold holy anointing oil.
Is any sick among you? let him call for the elders of the church; and let them pray over him, anointing him with oil in the name of the Lord: And the prayer of faith shall save the sick, and the Lord shall raise him up.
Oil was used anciently in the scriptures. Moses was commanded by God to make the holy anointing oil.
“Moreover the LORD spake unto Moses, saying, Take thou also unto thee principal spices, of pure myrrh five hundred shekels, and of sweet cinnamon half so much, even two hundred and fifty shekels, and of sweet calamus two hundred and fifty shekels, And of cassia five hundred shekels, after the shekel of the sanctuary, and of oil olive an hin: And thou shalt make it an oil of holy ointment, an ointment compound after the art of the apothecary: it shall be an holy anointing oil. (Exodus 30:22-25)”
Once the oil was made, it was consecrated as anointing oil. Many different religions still use consecrated oil (oil that is blessed specifically for the purpose of anointing) today. Anointing oil is primarily used to set apart an individual from the world and dedicate them to God.
However, throughout history, anointing oil was commonly used to anoint kings, to heal the sick, to cast out demons, and for cosmetics, medical and therapeutic practices.