14. let him call for the elders--not some one of the elders, as Roman Catholics interpret it, to justify their usage in extreme unction. The prayers of the elders over the sick would be much the same as though the whole Church which they represent should pray [BENGEL].
      anointing him with oil--The usage which Christ committed to His apostles was afterwards continued with laying on of hands, as a token of the highest faculty of medicine in the Church, just as we find in 1Co 6:2 the Church's highest judicial function. Now that the miraculous gift of healing has been withdrawn for the most part, to use the sign where the reality is wanting would be unmeaning superstition. Compare other apostolic usages now discontinued rightly, 1Co 11:4-15; 16:20. "Let them use oil who can by their prayers obtain recovery for the sick: let those who cannot do this, abstain from using the empty sign" [WHITAKER]. Romish extreme unction is administered to those whose life is despaired of, to heal the soul, whereas James' unction was to heal the body. CARDINAL CAJETAN [Commentary] admits that James cannot refer to extreme unction. Oil in the East, and especially among the Jews (see the Talmud, Jerusalem and Babylon), was much used as a curative agent. It was also a sign of the divine grace. Hence it was an appropriate sign in performing miraculous cures.
      in the name of the Lord--by whom alone the miracle was performed: men were but the instruments.

JFB.