'By Faith' in the Bible

Then those who responded [by faith] to the words [spoken by Peter and the apostles] were immersed, and about three thousand persons were added to them [i.e., the apostles] on that day.

And by [means of] the name [of Jesus], that is, by faith in the [power of His] name, this [crippled] man, whom you now see and know, was healed. Yes, it is the faith that comes through Jesus that is responsible for this man's perfect health, as you now all see.

And He did not discriminate between us [i.e., Jews] and them [i.e., Gentiles], cleansing their hearts [also] by faith [in Jesus].