Mark 11:20-30

20 In the early morning, as they passed by, they saw the fig-tree withered to the roots;

21 and Peter, recollecting, said to Him, "Look, Rabbi, the fig-tree which you cursed is withered up."

22 Jesus said to them, "Have faith in God.

23 In solemn truth I tell you that if any one shall say to this mountain, `Remove, and hurl thyself into the sea,' and has no doubt about it in his heart, but stedfastly believes that what he says will happen, it shall be granted him.

24 That is why I tell you, as to whatever you pray and make request for, if you believe that you have received it it shall be yours.

25 But whenever you stand praying, if you have a grievance against any one, forgive it, so that your Father in Heaven may also forgive you your offences."

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27 They came again to Jerusalem; and as He was walking in the Temple, the High Priests, Scribes and Elders came to Him

28 and asked, "By what authority are you doing these things? and who gave you authority to do them?"

29 "And I will put a question to you," replied Jesus; "answer me, and then I will tell you by what authority I do these things.

30 John's Baptism--was it of Heavenly or of human origin? Answer me."