Bible
The expression "servant of God" appears seven times in the Bible. All four times in the old testament, and one of the three times in the new testament, it refers to "Moses the servant of God" (1Chronicles 6:49; 2Chronicles 24:9; Nehemiah 10:29; Daniel 9:11; Revelation 15:3). In the new testament, Paul calls himself "a servant of God" in Titus 1:1, and James calls himself "a servant of God" in James 1:1. Following the rules of English grammar standardized in the King James Bible, the word "servant" is never capitalized or used as a title of nobility. ("The servant is not greater than his lord.")
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