The Evil One, as he is shown in the Bible.

The Bible of Omega IV was a religious text sacred to the Yangs, similar to their holy words.

Books of this Bible included Haggai, which had at least two chapters. A painting of the Evil One was placed opposite the page featuring the book of Haggai. This painting bore a marked resemblance to Spock.

In 2268, the Yang Scholar showed Cloud William the image in the Bible, as proof that Spock was the Evil One. (TOS: "The Omega Glory")

It was never determined whether this was any different to the Bible from Earth, or if they were indeed identical. This is due to the fact that it was never made clear as to the origin of the Yangs. A detailed closeup shot of the book, seen in Star Trek: The Original Series 365 reveals that the prop was the King James Bible, with the additional page of the "Evil One" drawing added.
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