Scriptures are:

Matthew 17:21 Howbeit this kind goeth not out but by prayer and fasting.

James 4:7 Submit yourselves therefore to God. Resist the devil, and he will flee from you. 8 Draw nigh to God, and he will draw nigh to you. Cleanse your hands, ye sinners; and purify your hearts, ye double minded. 9 Be afflicted, and mourn, and weep: let your laughter be turned to mourning, and your joy to heaviness. 10 Humble yourselves in the sight of the Lord, and he shall lift you up., King James Version