Talmud zu Bereschit 49:19

Rebbi Meïr said: It is written²³⁰Eccl. 2:14., “the wise man’s eyes are in his head.” The stupid one’s are where? In his legs²³¹This parallels the German saying that one must have in one’s legs what he does not have in his head.. Rebbi Abba Mari said, the wise man knows what will be the final outcome when he starts something. “Gad, a troop will gang up on him²³²Gen. 49:19. The reference naturally is to the entire verse, “Gad, a troop will gang up on him but he will catch their heel.”.” A troop comes to rob him, and he robs them.