'Faith' in the Bible

Beloved, when I gave all diligence to write unto you of the common salvation, it was needful for me to write unto you, and exhort you that ye should earnestly contend for the faith which was once delivered unto the saints.

Now it is my purpose to put you in mind, though you once had knowledge of all these things, of how the Lord, having taken a people safely out of Egypt, later sent destruction on those who had no faith;

But ye, beloved, building up yourselves on your most holy faith, praying in the Holy Ghost,