출애굽기 19:14의 미드라쉬

...And he took stones of the place - R. Judah and R. Nehemiah , and the Rabbis. Rabbi Yehuda said he took 12 Stones. God decreed that he establish twelve tribes. Jacob said; Abraham did not establish them , Isaac did not establish them, if the twelve stones join together, I know that I will merit twelve tribes. Once they did he knew he was going to merit establishing the twelve tribes . Rabbi Nehemiah said he took 3 stones. Jacob took three stones and said : God placed his name on Abraham, and on Isaac. I, if the stones join together, I know that God is the unifying name for me. And since joined, he knew that God would unify his names with Jacob. The Rabbis said that the minimum of the plural of stones is 2. Abraham produced negative attributes/waste- Ishmael and the sons of Keturah . And Isaac produced Esau and his generals. I, if you join these 2 stones together, I know that I will not produce any negative attributes in my descendants.