Mark 11:22-26 NRSV
Jesus answered them, “Have faith in God. Truly I tell you, if you say to this mountain, ‘Be taken up and thrown into the sea,’ and if you do not doubt in your heart, but believe that what you say will come to pass, it will be done for you. So I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours.
“Whenever you stand praying, forgive, if you have anything against anyone; so that your Father in heaven may also forgive you your trespasses.”
NRSV: New Revised Standard Version