?rayer:

If I Believe, Will I Receive?

20 As they passed by in the morning, they saw the fig tree withered away to its roots. 21 And Peter remembered and said to him, “Rabbi, look! The fig tree that you cursed has withered.”  22 And Jesus answered them, “Have faith in God. 23 Truly, I say to you, whoever says to this mountain, ‘Be taken up and thrown into the sea,’ and does not doubt in his heart, but believes that what he says will come to pass, it will be done for him.
24 Therefore I tell you, whatever you ask in prayer, believe that you have received it, and it will be yours. 25 And whenever you stand praying, forgive, if you have anything against anyone, so that your Father also who is in heaven may forgive you your trespasses.”

Mark 11:20-25 (ESV)