The answer is: New Testament

Only appears twice in KJV O.T.

When we look closely at the word "faith," it’s fascinating to note how its usage evolves from the Old to the New Testament. In the Old Testament, the concept is more about trust and obedience in God's character rather than a formal noun “faith.” The Septuagint (the Greek translation of the Hebrew Scriptures) shows a bit of this development, where terms related to faith in Hebrew transcend just believing—they're about acting in faith, following, and weaving trust into daily life.

Fast forward to the New Testament and voila! Total transformation! The concept of faith takes the spotlight, almost getting a complete makeover. The New Testament offers a vibrant discussion around faith, emphasizing both faith in Christ and God's faithfulness. This infusion can cause us to pause: Colossians 2:12 beautifully likens faith to our response to divine grace—it's proactive!

It’s also intriguing that the Greek word “pistis” is often paired with other beautiful ideas like hope and love. In 1 Corinthians 13, Paul cleverly places faith among the greatest virtues, similarly inviting us into community and connection—an echo of the loving-kindness highlight seen throughout the Old Testament, especially in Psalms and prophetic promises.

So, as you navigate the Scripture, consider how faith isn’t just a word but an evolving story of trust and conviction woven through the ancients and buoyed in the lives of believers today!