The oldest known stone tablet inscribed with the Ten Commandments sold for more than 5.0 million US dollars (£3.93 million) at an auction on Wednesday. Sotheby's said the 52kg marble slab was acquired by an anonymous buyer who plans to donate it to an Israeli institution. The tablet dates from 300-800AD and is inscribed with the commandments in Paleo-Hebrew script - the only complete example of its kind from antiquity, according to Sotheby's.