HEBREWS 11.6

and apart from faith it is impossible to please [Him], for it is required of him who is coming to God to believe that He exists and [that] He becomes a rewarder to those seeking Him.

HEBREWS 11.1-2

Now faith is [the] substance of things hoped for, [the] proof of matters not being seen, for by this, the elders were well-attested.

ROMANS 10.17

So then faith [is] by a report, and the report through a saying of God,