Matthew 21:18-22

In the early dawn the next morning, as He was coming back to the city, He was hungry. And as He saw one single leafy fig tree above the roadside, He went to it but He found nothing but leaves on it [seeing that in the fig tree the fruit appears at the same time as the leaves]. And He said to it, Never again shall fruit grow on you! And the fig tree withered up at once. When the disciples saw it, they marveled greatly and asked, How is it that the fig tree has withered away all at once? And Jesus answered them, Truly I say to you, if you have faith (a firm relying trust) and do not doubt, you will not only do what has been done to the fig tree, but even if you say to this mountain, Be taken up and cast into the sea, it will be done. And whatever you ask for in prayer, having faith and [really] believing, you will receive.