James 5:15-16

15And the prayer of faith will save the one who is sick, and the Lord will raise him up. And aif he has committed sins, he will be forgiven. 16Therefore, bconfess your sins to one another and pray for one another, cthat you may be healed. dThe prayer of a righteous person has great power as it is working.
Or The effective prayer of a righteous person has great power

1 Peter 4:7

7 fThe end of all things is at hand; therefore gbe self-controlled and sober-minded hfor the sake of your prayers.

1 John 5:14-15

14And this is ithe confidence that we have toward him, that jif we ask anything according to his will he hears us. 15And if we know that he hears us in whatever we ask, we know that we have the requests that we have asked of him.

Copyright information for ESV