Matthew 21:18-22

18Now early in the morning, as Jesus was coming back to the city, He was hungry.

19Seeing a lone fig tree at the roadside, He went to it and found nothing but leaves on it; and He said to it, “Never again will fruit come from you.” And at once the fig tree withered.

20When the disciples saw it, they were astonished and asked, “How is it that the fig tree has withered away all at once?”

21Jesus replied to them, “I assure you and most solemnly say to you, if you have faith [personal trust and confidence in Me] and do not doubt or allow yourself to be drawn in two directions, you will not only do what was done to the fig tree, but even if you say to this mountain, ‘Be taken up and thrown into the sea,’ it will happen [if God wills it].

22And whatever you ask for in prayer, believing, you will receive.”