Where does the Bible say what faith is?
It is in Hebrews 11:1 · King James Version
«Now faith is the substance of things hoped for, the evidence of things not seen.»Read the chapter Hebrews 11 →
See also
Hebrews 11:6
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.
Romans 10:17
So then faith cometh by hearing, and hearing by the word of God.