Targum su Numeri 2:18

The camp of Ephraim by the standard of their hosts shall pitch on the west; their camp spreadeth over four miles; and their standard is of silk of three colours, corresponding with the precious stones in the breastplate, ligure, agate, and amethyst; and upon it expressed and set forth the names of the three tribes, Ephraim, Menasheh and Benjamin, having written in the midst, And the Cloud of the Lord was over them, in the going forward of the host; and upon it was set forth the figure of a young man. And the Rabba set over the tribe of Ephraim, Elishama bar Ammihud;