Mark 11:23-25

I tell you the truth, you can say to this mountain, ‘May you be lifted up and thrown into the sea,’ and it will happen. But you must really believe it will happen and have no doubt in your heart. I tell you, you can pray for anything, and if you believe that you’ve received it, it will be yours. But when you are praying, first forgive anyone you are holding a grudge against, so that your Father in heaven will forgive your sins, too.”