When Rabbi Eliezer, on his deathbed, taught Rabbi Akiva three hundred particulars to be observed in regard to the white spot covered with hair which was the sign of leprosy, the former lifted up his arms and placed them on his chest and exclaimed, " Woe is me, because of these my two arms, these two scrolls of the law, that are about to depart from this world; for if all the seas were ink, and all the reeds were quills, and all the men were scribes, they could not record all I have learned and all I have taught, and how much I have heard at the lips of sages in the schools. And what is more, I also taught three hundred laws based on the text, (A witch shall not live.**