וְאֶת־בְּרִיתִ֖י אָקִ֣ים אֶת־יִצְחָ֑ק אֲשֶׁר֩ תֵּלֵ֨ד לְךָ֤ שָׂרָה֙ לַמּוֹעֵ֣ד הַזֶּ֔ה בַּשָּׁנָ֖ה הָאַחֶֽרֶת׃
Pour mon alliance, je la confirmerai sur Isaac, que Sara t’enfantera à pareille époque, l’année prochaine."
Jerusalem Talmud Nedarim
HALAKHAH: Rebbi Yoḥanan bar Marya said, it is written: “On that day, the Eternal concluded a covenant with Abram as follows,” etc., up to “but my covenant I shall affirm with Isaac,” etc., thirteen covenants160In Gen. 17:2–21 the word “covenant” appears 12 times. Therefore, Gen. 15:18 is added to reach the lucky number 13, the number of God’s attributes of mercy (Ex. 34:6–7) even though it speaks of a prior covenant; cf. the preceding Note..