That depends on which version of the Bible. Translating literally from Ancient Hebrew, Aramaic or Greek manuscripts is difficult if not impossible. So word counts can differ. According to this Christian Bible Study group :

http://www.twopaths.com/index.htm

Their chart on word counts in four popular versions of the Bible show that "faith" occurs 4 times in the Old Testament of the New American Standard Version (1995 ed.) :

http://www.twopaths.com/faq_WordCount.htm

Here are some cool Bible statistics :

http://www.trivia-library.com/a/bible-numbers-and-statistics.htm

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These are the four places it appears:

Who is the liar but he who denies that Jesus is the Christ? This is the antichrist, he who denies the Father and the Son. 1 John 2:22

Children, it is the last hour, and as you have heard that
antichrist is coming, so now many antichrists have come. Therefore we
know that it is the last hour. 1 John 2:18

And every spirit that confesseth not that Jesus Christ is come
in the flesh is not of God: and this is that spirit of antichrist,
whereof ye have heard that it should come; and even now already is it
in the world. 1 John 4:3

Many deceivers have gone out into the world; they do not confess
the coming of Jesus Christ in the flesh. This is the deceiver and the
antichrist.