his word was with power
And God said, Let there be light: and there was light.
And God said, Let the waters under the heaven be gathered together unto one place, and let the dry land appear: and it was so.
And God said, Let the earth bring forth grass, the herb yielding seed, and the fruit tree yielding fruit after his kind, whose seed is in itself, upon the earth: and it was so.
And God said, Let there be lights in the firmament of the heaven to divide the day from the night; and let them be for signs, and for seasons, and for days, and years: and let them be for lights in the firmament of the heaven to give light upon the earth: and it was so.
Genesis 1:3, 9, 11, 14-15 KJV
And he arose, and rebuked the wind, and said unto the sea, Peace, be still. And the wind ceased, and there was a great calm.
Mark 4:39 KJV
And when he thus had spoken, he cried with a loud voice, Lazarus, come forth. And he that was dead came forth, bound hand and foot with graveclothes: and his face was bound about with a napkin. Jesus saith unto them, Loose him, and let him go.
John 11:43-44 KJV
So then faith cometh by hearing, and hearing by the word of God.
Romans 10:17 KJV
And the LORD said unto Moses, Stretch out thine hand toward heaven, that there may be darkness over the land of Egypt, even darkness which may be felt.
And Moses stretched forth his hand toward heaven; and there was a thick darkness in all the land of Egypt three days:
Exodus 10:21-22 KJV
Faith can do amazing things if it's something God said to do and promised a result like that example