Once the canon of the first portion of Bible scriptures had been closed in the Post-Exilic period, the Scriptures still had to be preserved and copied. The faithful execution of this duty was the job of the scribes (sopherim).
But the sopherim went a little beyond just copying the Scriptures. Since the Scriptures were read aloud regularly, the scribes introduced variants through the medium of Keri (to be read) and Kethiv (to be written). And as the language changed, translations were made. The scribes made Aramaic paraphrases of the Hebrew, called Targums.

The scribes are also responsible for the vowel points for vocalizing the Hebrew text -- these being added in the later half of the first millenium A.D. This is known as the Mikra Sopherim (the reading prescribed by the scribes). The scribes also removed phrases denoting "anthropomorphisms" and employed euphemisms for what they thought were indelicate expressions. These are called Tikkuney Sopherim (the emendations of the scribes).

What follows is a list of a particular group of these scribal emendations. If you look in the margins of the standard Hebrew codices, you will notice small writing -- called the Massorah. A note in the Massorah against several passages in the manuscripts of the Hebrew Bible states: "This is one of the Eighteen Emendations of the Sopherim" -- or words to that effect.

This is a list of the eighteen emendations, together with nine others not included in the official lists. These changes obscure the real meaning of the passage -- because of the attempt on the scribe's part to either "dehumanize" or to protect God. The idea of anthropomorphism is that man created God in his (man's) own image, and ascribed to God human characteristics -- but that God really doesn't have eyes, nose, etc. The other changes (to protect God) constitute a watering down of scripture from its plain, tell-it-like-it-is statements.