James Five Thirteen-Twenty
Is anyone among you suffering? Let him pray. Is anyone cheerful? Let him sing psalms. Is anyone among you sick? 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 will save the sick, and the Lord will raise him up. And if he has committed sins, he will be forgiven. Confess your trespasses e to one another, and pray for one another, that you may be healed. The effective, fervent prayer of a righteous man avails much. Elijah was a man with a nature like ours, and he prayed earnestly that it would not rain; and it did not rain on the land for three years and six months. And he prayed again, and the heaven gave rain, and the earth produced its fruit. Brethren, if anyone among you wanders from the truth, and someone turns him back, let him know that he who turns a sinner from the error of his way will save a soul f from death and cover a multitude of sins.

Just as he has already advised the person who has been injured, so now James gives his advice to the one who is ill. In order to prevent the foolishness of complaining, he told the injured person to pray and sing, and now he tells the person who is sick, either in body or in faith, to call the elders in proportion to the gravity of the illness which he is enduring. James does not advise this person to call the younger members of the church because they are less experienced in such matters and run the risk of saying or doing something which will make matters worse. We read in the New Testament that the apostles did this sort of thing, and the custom is retained in the church, that the priests will anoint a person who is ill and pray for his healing. And this is not the prerogative of the priests only, for in cases of necessity any Christian may do this, provided that he uses only oil which has been consecrated by the bishop. And of course anyone who anoints a sick person in this way must invoke the name of God over him while doing so.

St Bede