And they cast out many devils, and {h} anointed with oil many that were sick, and healed them.

(h) This oil was a token and a sign of his marvellous virtue: and seeing that the gift of healing has stopped a good while since, the ceremony of anointing which is yet carried on by some is of no purpose.

People's New Testament

6:13 Anointed with oil. Matthew says nothing of this. Oil was a symbol of the Divine grace; to anoint with it, of the Holy Spirit. Its use implied that God was the healer.

Wesley's Notes

6:13 They anointed with oil many that were sick - Which St. James gives as a general direction, Jas 5:14,15, adding those peremptory words, And the Lord shall heal him - He shall be restored to health: not by the natural efficacy of the oil, but by the supernatural blessing of God. And it seems this was the great standing means of healing, desperate diseases in the Christian Church, long before extreme unction was used or heard of, which bears scarce any resemblance to it; the former being used only as a means of health; the latter only when life is despaired of.

Matthew Henry's Concise Commentary

6:7-13 Though the apostles were conscious to themselves of great weakness, and expected no wordly advantage, yet, in obedience to their Master, and in dependence upon his strength, they went out. They did not amuse people with curious matters, but told them they must repent of their sins, and turn to God. The servants of Christ may hope to turn many from darkness unto God, and to heal souls by the power of the Holy Ghost.