The astrologers in Egypt said to Pharaoh, "What! shall a slave whose
master bought him for twenty pieces of silver rule over us?" Pharaoh
replied, "But I find him endowed with kingly qualities." "If that is the
case," they answered, "he must know seventy languages." Then came the
angel Gabriel, and taught him seventy languages.
THE TALMUD, _Soteh_, fol. 36, col. 2.