Leviticus 26:42

וזכרתי את בריתי יעקוב THEN I WILL REMEMBER MY COVENANT WITH JACOB — In five places in Scripture it (the name יעקב) is written plene (יעקוב) and the name אליהו is written defectively in five places, to intimate that Jacob — as it were — took one letter of his (Elijah’s) name as a pledge that at some future time he should come and proclaim the good tidings of his descendants’ redemption (cf. Midrash ‎חסירות ויתירות). ‎ וזכרתי את בריתי יעקוב‎ THEN I WILL REMEMBER MY COVENANT WITH JACOB [AND ALSO MY COVENANT WITH ISAAC, AND ALSO MY COVENANT WITH ABRAHAM WILL I REMEMBER] — Why are they (the patriarchs) enumerated here in a reverse order (in contrast to e. g., Exodus 32:13, where it states: ‎'לאברהם ליצחק ולישראל וכו‎‎‎זכור ‏)? It is to say: Jacob the youngest among the patriarchs is worthy of this that, through his merits, his children should be redeemed; if he be not sufficiently worthy, behold, the merit of Isaac is with him; if that does not suffice, behold, then there is Abraham with him who is surely worthy enough! And why does Scripture not use the word “remember” in connection with Isaac’s name? Because this is unnecessary, for — says God, as it were — the ashes of Isaac (who according to My command to Abraham was to become a burnt offering) are ever visible before Me as though they were heaped up lying upon the altar (Sifra, Bechukotai, Chapter 8 6-7).

וְזָכַרְתִּ֖י אֶת־בְּרִיתִ֣י יַעֲק֑וֹב וְאַף֩ אֶת־בְּרִיתִ֨י יִצְחָ֜ק וְאַ֨ף אֶת־בְּרִיתִ֧י אַבְרָהָ֛ם אֶזְכֹּ֖ר וְהָאָ֥רֶץ אֶזְכֹּֽר׃

Then will I remember my covenant with Ya῾aqov, and also my covenant with Yiżĥaq, and also my covenant with Avraham will I remember; and I will remember the land.