A book curse was a widely employed method of discouraging the thievery of manuscripts during the medieval period. The use of book curses dates back much further, to pre-Christian times, when the wrath of gods was invoked to protect books and scrolls.
The earliest known book curse can be traced to Ashurbanipal, King of Assyria from 668 to 627 BCE, who had the following curse written on many or all of the tablets collected at the library at Ninevah, considered to be the earliest example of a systematically collected library:
I have transcribed upon tablets the noble products of the work of the scribe which none of the kings who have gone before me had learned, together with the wisdom of Nabu insofar as it existeth [in writing]. I have arranged them in classes, I have revised them and I have placed them in my palace, that I, even I, the ruler who knoweth the light of Ashur, the king of the gods, may read them. Whosoever shall carry off this tablet, or shall inscribe his name on it, side by side with mine own, may Ashur and Belit overthrow him in wrath and anger, and may they destroy his name and posterity in the land.
Another curse from Ninevah states: "Whoever removes [the tablet], writes his name in the place of my name, may Ashur and Ninlil, angered and grim, cast him down, erase his name, his seed, in the land. Other book curses were more discreet: “He who fears Anu, Enlil, and Ea will return it to the owner’s house the same day”, and “He who fears Anu and Antu will take care of it and respect it”.
Because these tablets were made of clay, and thus easily vandalized, there were specific curses to protect against such acts, such as: “In the name of Nabu and Marduk, do not rub out the text!”Nabu was the Babylonian god of writing and wisdom, son of Marduk and Sarpanitu. A more detailed curse to prevent vandalism went as follows:
He who breaks this tablet or puts it in water or rubs it until you cannot recognize it [and] cannot make it to be understood, may Ashur, Sin, Shamash, Adad and Ishtar, Bel, Nergal, Ishtar of Ninevah, Ishtar of Arbela, Ishtar of Bit Kidmurri, the gods of heaven and earth and the gods of Assyria, may all these curse him with a curse that cannot be relieved, terrible and merciless, as long as he lives, may they let his name, his seed, be carried off from the land, may they put his flesh in a dog’s mouth”.