There are no verses that use the word 'faith' in the King James Version, Old Testament, according to the Bible Encyclopedia and Concordance, edited by JL Hurlbut and AJP McClure copyright 1944, by the John C Winston Co.
There are 2 verses that use the word 'faith' in the New International Version, Old Testament, according to The Thompson Comprehensive Bible Helps, 2nd Ed, Copyright 1990, BB Kirkbride Bible Co, Inc. These are:
II Chron 20:20 "...Have faith
in the Lord your God..."
Hab 2:4 "...but the righteous will live by his faith
Yes it is. The Old Testament (King James version) contains 58 references to faith in several variations: "faith" (twice; Deuteronomy 32:20 and Habakkuk 2:4), "faithful" (30 times), "faithfully" (8 times), and "faithfulness" (19 times).
The idea of faith (or lack of it) is also represented any number of times by words such as "believe," "belief" and "trust."