Huehnergard and Liebowitz suggest that, given the key role of the escape from Egyptian bondage in ancient Jewish law, the Torah originally banned tattooing because it was “the symbol of servitude.” Interestingly, though, they write that there’s one other apparent reference to tattooing in the Hebrew Bible. Isaiah 44:5 describes the children of Jacob committing themselves to God: “One shall say, ‘I am the LORD’s’… Another shall mark his arm ‘of the LORD.’” Here a tattoo appears to be allowable as a sign of submission, not to a human master but to God.