The Power Of Effective, Fervent Prayer

Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much. Elias was a man subject to like passions as we are, and he prayed earnestly that it might not rain: and it rained not on the earth by the space of three years and six months. And he prayed again, and the heaven gave rain, and the earth brought forth her fruit.
James 5:16-18

Dwelling By The Brook

And Elijah the Tishbite, who was of the inhabitants of Gilead, said unto Ahab, “As the LORD God of Israel liveth, before whom I stand, there shall not be dew nor rain these years, but according to my word.”  And the word of the LORD came unto him, saying,
“Get thee hence, and turn thee eastward, and hide thyself by the brook Cherith, that is before Jordan. And it shall be, that thou shalt drink of the brook; and I have commanded the ravens to feed thee there.”
So he went and did according unto the word of the LORD: for he went and dwelt by the brook Cherith, that is before Jordan.  And the ravens brought him bread and flesh in the morning, and bread and flesh in the evening; and he drank of the brook. And it came to pass after a while, that the brook dried up, because there had been no rain in the land.
1 Kings  17:1-7