Commentary for 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).

THEN WILL I REMEMBER MY COVENANT WITH JACOB. Rabbi Abraham ibn Ezra commented that this [is a case where a word] draws along with itself another [similar] word, thus meaning: “Then will I remember My covenant, the covenant with Jacob.¹⁷²The reason for this explanation is that the word brithi (My covenant) is grammatically equivalent to saying habrith sheli (the covenant of Mine). Now since a noun that is preceded by the definite article cannot be in the construct state, it follows that there is a word implied here, which makes it: eth brithi ‘brith’ Ya’akov (My covenant, the covenant of Jacob). A similar explanation applies to the following two verses which Ramban mentions. Similarly: the prophecy of Oded the prophet;¹⁷³II Chronicles 15:8. Here too the meaning is: v’hanevuah ‘nevuath’ Oded hanavi’ (and the prophecy — a prophecy of Oded the prophet). your heads of your tribes.¹⁷⁴Deuteronomy 29:9. The meaning here too is: rasheichem ‘rashei’ shivteichem (your heads — heads of your tribes). And the Land I will remember. The meaning thereof is that I will remember the Land, and that it was paid its Sabbaths and lay forsaken without them, and I will remember that they have atoned for their iniquity.”
It is possible according to the way of Truth, [the mystic doctrines of the Cabala], that He is saying: “And I will remember Jacob and Isaac and Abraham, who are the men of the covenant,” for all attributes are so called when they are in the covenant; “v’ha’aretz (and the earth),¹⁷⁵See Ramban above, 25:2 (towards the end) about the meaning of the word ha’aretz. which is composed of them all, I will remember among them.” Our Rabbis have so alluded. Thus they said:¹⁷⁶Vayikra Rabbah 36:7. “And why does He mention the merit of ha’aretz with them? Said Rabbi Shimon ben Lakish: This is like the case of a master who had three daughters, and one maidservant who raised them. Whenever the master asked about the welfare of his daughters, he would say: ‘Ask on my behalf about the welfare of she who raises them.’”

וזכרתי את בריתי, by allowing the second Temple to be built.