מדרש אויף תהילים 112:2

Chapter 33 Writings: [1] "Blessed is the man who fears the Lord" (Psalm 112:1). This means that in the end, everything will be heard by God: "Fear God and keep His commandments, for this is the whole duty of man" (Ecclesiastes 12:13). How does one ultimately succeed? Nothing is more beloved than one who fears the Almighty, as it is written, "In the end, everything will be heard," etc. In the custom of the world, one person says to his friend, "I am rich and have plenty of wheat, oil, and wine." His friends tell him, "You have everything, where will you put it? If you have no storage, you have nothing." Similarly, one who is rich and wise in knowledge, but does not have fear of sin, has nothing, as it is written, "In the end, everything will be heard," etc. For this reason, David said, "Blessed is the man who fears the Lord." This refers to Abraham, as it is written, "Now I know that you fear God" (Genesis 22:12). "He delights greatly in His commandments" (Psalm 112:1). This refers to Abraham, as it is written, "Because Abraham obeyed Me and kept My charge, My commandments, My statutes, and My laws" (Genesis 26:5). "His descendants will be mighty on earth" (Psalm 112:2). This refers to Isaac, as it is written, "In Isaac shall thy seed be called" (Genesis 21:12). What is written afterwards? "And the man waxed great, and went forward, and grew until he became very great" (Genesis 26:13). "The generation of the upright will be blessed" (Psalm 112:2). And Abraham was old and well-stricken in age; and the Lord had blessed Abraham in all things" (Genesis 24:1). Similarly, God blessed Isaac after Abraham's death, as it is written, "And after the death of Abraham, God blessed Isaac his son" (Genesis 25:11). Therefore it is said, "The generation of the upright will be blessed."

"His offspring will be mighty in the land." What is the reward for this? "His offspring will be mighty in the land" - this refers to Isaac, as it is said, "For through Isaac shall your offspring be named" (Genesis 21:12). And what was his strength? He prayed for his wife to conceive, as it is said, "And Isaac prayed to the Lord on behalf of his wife" (Genesis 25:21). Is there a greater strength than this, that he prayed for an infertile woman to conceive?

Another explanation: "His offspring will be mighty in the land." This refers to Jacob, as it is said, "But now thus says the Lord, he who created you, O Jacob, he who formed you, O Israel: 'Fear not, for I have redeemed you; I have called you by name, you are mine'" (Isaiah 43:1). And what was his strength? He wrestled with the angel and prevailed, as it is said, "And Jacob wrestled with the angel" (Hosea 12:5). "May the righteous flourish in their days" (Psalm 72:7) - these are the twelve tribes of Israel.