Literatur des Zweiten Tempels zu Bereschit 37:3

[6] It is evident from these words that they are in the plain, caring for the irrational powers within them. And, because he is unable to bear the too great severity of his father’s knowledge, Joseph is sent to them, that in the hands of more lenient instructors he may learn what he ought to do and what will be beneficial; for the creed he has hitherto followed is one woven of incongruous elements, multifarious and complex in the highest degree. This is why the lawgiver says that a coat of many colours was made for him (Gen. 37:3), indicating by this that he is the promulgator of a doctrine full of mazes and hard to disentangle.

[220] For we are told that he had a coat of varied colours (Gen. 37:3). He did not besprinkle himself with lustral rites, from which he would have learned that he was an amalgam of ashes and water, and was incapable of touching the all-white and gleaming vestment, which is virtue, but arrayed himself in the woven robe of statecraft, a robe richly variegated, containing but a most meagre admixture of truth, but many large portions of false, probable, plausible, conjectural matter, out of which sprang up all the sophists of Egypt, augurs, ventriloquists, soothsayers, proficients in decoying, charming, and bewitching, whose insidious artifices it is no easy task to escape.