Kabbalah sobre Génesis 1:21

Come and behold, Jacob knew that Esau had to cleave to the tortuous serpent. As a result, in all that Esau did, he acted as slyly and crookedly, just like another just like another tortuous serpent. This is as it ought to be. This agrees with the words of Rabbi Shimon, "And Elohim created the great crocodiles," which refer to Jacob and Esau, "and every living creature that moves" (Gen. 1:21), refers to the levels between them. By necessity, Jacob needed to behave wisely against the other serpent. This is as it must be.

Teninim ha-Gedolim (“The Great Dragons” [Gen. 1:21]). The three “patriarchs.”