Talmud zu Bereschit 23:13

Rebbi Ḥanania in the name of Rebbi Phineas: Corresponding to the eighteen times the Patriarchs are mentioned together in the Torah, Abraham, Isaac, Jacob. If somebody will tell you that there are nineteen, tell him that Behold, the Eternal was standing on it⁹⁸Gen. 23:13. In this verse Jacob is not mentioned by name. is not counted. If somebody will tell you that there are seventeen, tell him that My name should be called over them, as well the names of my fathers Abraham and Isaac⁹⁹Gen. 48:16. Jacob’s name is mentioned implicitly. is counted.

Rebbi Ḥanina in the name of Rebbi Phineas: Corresponding to the eighteen times the Patriarchs are mentioned together in the Torah, Abraham, Isaac, Jacob. If somebody will tell you that there are nineteen, tell him that (Gen. 23:13) “Behold, the Eternal was standing over him” is not counted¹⁴⁸Since Jacob is not mentioned in that verse.. If somebody will tell you that there are seventeen, tell him that (Gen. 48:16) “My name should be called over them, as well the names of my fathers Abraham and Isaac” is counted¹⁴⁹Since Jacob is mentioned implicitly; he speaks about “my name”..