(מב) וְזָכַרְתִּי אֶת בְּרִיתִי יַעֲקוֹב וְאַף אֶת בְּרִיתִי יִצְחָק וְאַף אֶת בְּרִיתִי אַבְרָהָם אֶזְכֹּר וְהָאָרֶץ אֶזְכֹּר.
(42) then will I remember My covenant with Jacob, and also My covenant with Isaac, and also My covenant with Abraham will I remember; and I will remember the land.
ולמה הוא מזכיר זכות אבות ומזכיר זכות הארץ עמהם? אמר ריש לקיש: משל למלך שהיה לו שלשה בנים ושפחה אחת משלו מגדלתן. כל זמן שהיה המלך שואל שלום בניו היה אומר: שאלו לי בשלום המגדלת. כך כל זמן שהקדוש ברוך הוא מזכיר אבות מזכיר הארץ עמהם, הדא הוא דכתיב: וזכרתי את בריתי יעקב וגו' והארץ אזכור:
Why, in mentioning the merit of the fathers, does Scripture mention with them the merit of the Land? Resh Lakish told the parable of a king who had three sons, all of them brought up by one of his maidservants. So whenever the king inquired about the well-being of his sons, he would add: "Inquire also about the well-being of her who brought them up." So, too, whenever the Holy One mentions the fathers, He mentions the Land with them. Thus it is written, "Then will I remember My covenant with Jacob...and I will remember the land."
Tanna Devei Eliyahu
In Egypt, the Israelites gathered to dwell as a group, all of them becoming as one, and they convenanted to act with loving-kindness toward one another; to be loyal to the covenant of Abraham, Isaac, and Jacob; not to forsake the language of the house of their father [Jacob]; and not to adopt the language of Egypt, because it might lead them to idolatry.
And when Israel in Egypt continued to circumcise their sons, the Egyptians would say to them, "Why do you circumcise your sons? Will they not in no time at all be flung into the river?" Israel replied, "We will circumcise them nevertheless. You do with them as you wish -- he who is to die will die, he who is to be slain will be slain, and he who is destined to live will live."