Éxodo 32:15

Y volvióse Moisés, y descendió del monte trayendo en su mano las dos tablas del testimonio, las tablas escritas por ambos lados; de una parte y de otra estaban escritas.

¶ And Moses turned, and went down from the mount, and the two tables of the testimony were in his hand: the tables were written on both their sides; on the one side and on the other were they written.