Matthew 21:18-22

18 Now in the morning, as he returned to the city, he was hungry.  19 Seeing a fig tree by the road, he came to it, and found nothing on it but leaves. He said to it, “Let there be no fruit from you forever!”  Immediately the fig tree withered away.  20 When the disciples saw it, they marveled, saying, "How did the fig tree immediately wither away?"

21 Jesus answered them, “Most assuredly I tell you, if you have faith, and don't doubt, you will not only do what is done to the fig tree, but even if you told this mountain, 'Be taken up and cast into the sea,' it would be done.  22 All things, whatever you ask in prayer, believing, you will receive.”