וְאֶת־בְּרִיתִ֖י אָקִ֣ים אֶת־יִצְחָ֑ק אֲשֶׁר֩ תֵּלֵ֨ד לְךָ֤ שָׂרָה֙ לַמּוֹעֵ֣ד הַזֶּ֔ה בַּשָּׁנָ֖ה הָאַחֶֽרֶת׃
Mas yo estableceré mi pacto con Isaac, al cual te parirá Sara por este tiempo el año siguiente.
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..