The oil in the Old and New Testaments was often a symbol of something God wanted to affirm to his children. The oil itself had no medicinal value and no supernatural power. Anointing too was a symbolic act. Kings were anointed for their ministries. It was a sign of God’s blessing and hand being upon the one that was anointed. That same symbolism is true for those asking to be anointed for healing. 
· Neither shall he go out of the sanctuary, nor profane the sanctuary of his God; for the crown of the anointing oil of his God is upon him: I am the LORD. (Leviticus 21:12)
· And Zadok the priest took an horn of oil out of the tabernacle, and anointed Solomon. And they blew the trumpet; and all the people said, God save king 
· Solomon. (1 Kings 1:39)
· The Spirit of the Lord GOD is upon me; because the LORD hath anointed me to preach good tidings unto the meek; he hath sent me to bind up the brokenhearted, to proclaim liberty to the captives, and the opening of the prison to them that are bound; (Isaiah 61:1)

Oil Of Blessing
· But my horn shalt thou exalt like the horn of an unicorn: I shall be anointed with fresh oil. (Psalms 92:10)
· Thou preparest a table before me in the presence of mine enemies: thou anointest my head with oil; my cup runneth over. (Psalms 23:5)

Oil of Refreshing
· My head with oil thou didst not anoint: but this woman hath anointed my feet with ointment. (Luke 7:46)
· And satest upon a stately bed, and a table prepared before it, whereupon thou hast set mine incense and mine oil. (Ezekiel 23:41)
· Then washed I thee with water; yea, I throughly washed away thy blood from thee, and I anointed thee with oil. (Ezekiel 16:9)

Oil of Healing
· And went to him, and bound up his wounds, pouring in oil and wine, and set him on his own beast, and brought him to an inn, and took care of him. (Luke 10:34)
· And they cast out many devils, and anointed with oil many that were sick, and healed them. (Mark 6:13)

Oil Of Gladness
· Thou hast loved righteousness, and hated iniquity; therefore God, even thy God, hath anointed thee with the oil of gladness above thy fellows. (Hebrews 1:9)
· Thus saith the LORD, the Holy One of Israel, and his Maker, Ask me of things to come concerning my sons, and concerning the work of my hands command ye me. (Isaiah 45:11)
· I form the light, and create darkness: I make peace, and create evil: I the LORD do all these things. (Isaiah 45:7)
· To appoint unto them that mourn in Zion, to give unto them beauty for ashes, the oil of joy for mourning, the garment of praise for the spirit of heaviness; that they might be called trees of righteousness, the planting of the LORD, that he might be glorified. (Isaiah 61:3)