Mark 11:27 (KJV)

And Jesus answering saith unto them, Have faith in God.

For verily I say unto you, That whosoever shall say unto this mountain, Be thou removed, and be thou cast into the sea; and shall not doubt in his heart, but shall believe that those things which he saith shall come to pass; he shall have whatsoever he saith.

Therefore I say unto you, What things soever ye desire, when ye pray, believe that ye receive them, and ye shall have them.

And when ye stand praying, forgive, if ye have ought against any: that your Father also which is in heaven may forgive you your trespasses.

But if ye do not forgive, neither will your Father which is in heaven forgive your trespasses.

And say unto him, By what authority doest thou these things? and who gave thee this authority to do these things?

And Jesus answered and said unto them, I will also ask of you one question, and answer me, and I will tell you by what authority I do these things.

The baptism of John, was it from heaven, or of men? answer me.

And they reasoned with themselves, saying, If we shall say, From heaven; he will say, Why then did ye not believe him?

But if we shall say, Of men; they feared the people: for all men counted John, that he was a prophet indeed.