Philo Judaeus De Josepho 101

[101] For he thought that seven oxen were coming slowly up out of the river, fat and very well fleshed, beautiful to look upon, and that they began to feed by the river; after which seven others, equal in number, destitute of flesh in a strange degree, and very lean, came up, exceedingly ill-favoured, and they too fed alongside of the others. Then, on a sudden, the better oxen were devoured by the inferior ones, and yet those who ate them were in none, not even in the very slightest degree, increased in bulk in their bodies, but were still leaner than before, or at all events, not less lean;