And they brought him unto him: and when he saw him, straightway the spirit tare him; and he fell on the ground, and wallowed foaming.(Mark 9:20)

And he asked his father, How long is it ago since this came unto him? And he said, Of a child.(Mark 9:21)

And ofttimes it hath cast him into the fire, and into the waters, to destroy him: but if thou canst do any thing, have compassion on us, and help us.(Mark 9:22)

Jesus said unto him, If thou canst believe, all things are possible to him that believeth.

And straightway the father of the child cried out, and said with tears, Lord, I believe; help thou mine unbelief.(Mark 9:24)

When Jesus saw that the people came running together, he rebuked the foul spirit, saying unto him, Thou dumb and deaf spirit, I charge thee, come out of him, and enter no more into him.(Mark 9:25)

And the spirit cried, and rent him sore, and came out of him: and he was as one dead; insomuch that many said, He is dead.(Mark 9:26)

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Mark 9:23 - Cross Reference

Jesus answered and said unto them, Verily I say unto you, If ye have faith, and doubt not, ye shall not only do this which is done to the fig tree, but also if ye shall say unto this mountain, Be thou removed, and be thou cast into the sea; it shall be done. (Matthew 21:21)

And the Lord said, If ye had faith as a grain of mustard seed, ye might say unto this sycamine tree, Be thou plucked up by the root, and be thou planted in the sea; and it should obey you. (Luke 17:6)

Then said Jesus unto him, Except ye see signs and wonders, ye will not believe. (John 4:48)

But without faith it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him. (Hebrews 11:6)

The same heard Paul speak: who stedfastly beholding him, and perceiving that he had faith to be healed, (Acts 14:9)

Jesus saith unto her, Said I not unto thee, that, if thou wouldest believe, thou shouldest see the glory of God? (John 11:40)

And Jesus said unto them, Because of your unbelief: for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you. (Matthew 17:20)

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. (Mark 11:23)

And they rose early in the morning, and went forth into the wilderness of Tekoa: and as they went forth, Jehoshaphat stood and said, Hear me, O Judah, and ye inhabitants of Jerusalem; Believe in the LORD your God, so shall ye be established; believe his prophets, so shall ye prosper. (2 Chronicles 20:20)