Ya'akov 5:13-18

If anyone is suffering among you, let him daven. If anyone has simcha, let him sing niggunim. Are there any cholim (sick ones) among you? Let the choleh (sick person) summon the Ziknei HaKehillah (Elders of the Congregation) and let them daven tefillos over him, having applied the shemen mishchah (anointing oil), b'Shem Adoneinu. And the tefillah of emunah will deliver the choleh (sick person), and HASHEM will raise him up. And if he may have been committing peysha'im, he will be given selicha (forgiveness). Therefore, make vidduy (confession of sin) to one another, and daven tefillos on behalf of one another, so that you may have refuah sheleimah (complete healing). The tefillah of a tzaddik is powerful and effective. Eliyahu [HaNavi] was a man of like nature to us, and with tefillah he davened for it not to rain, and it did not rain upon ha'aretz for shalosh shanim and shishah chodashim (three years and six months). And again Eliyahu [HaNavi] davened, and Shomayim gave GESHEM (rain) and ha'aretz caused its p'ri to sprout.