Esau said, " I will not kill my brother Jacob with bow and arrow, but with my mouth I will suck his blood, as it is said (Gen. xxxiii. 4), "And Esau ran to meet him, and embraced him, and kissed him, and they wept." Read not "and he kissed him," but read, " and he bit him.* The neck of Jacob, however, became as hard as ivory, and it is respecting him that Scripture says (Cant. vii. 5), "Thy neck is as a tower of ivory," — so that the teeth of Esau became blunted; and when he saw that his desire could not be gratified, he began to be angry, and gnashed his teeth, as it is said (Ps. cxii. 10), " The wicked shall see it and be grieved; he shall gnash with his teeth."