The Catechism in Questions & Answers

263. How was blessing experienced in the old covenant?

The promise of blessing is a component of the covenant which God made with Israel. In the old covenant, the blessing of God was revealed primarily through earthly wellbeing. For example, this included such things as victory in battle against enemies, long life, wealth, numerous descendants, and fertile land.
Abraham was blessed by God: “I will make you a great nation; I will bless you and make your name great; and you shall be a blessing. I will bless those who bless you, and I will curse him who curses you; and in you all the families of the earth shall be blessed” (Genesis 12: 2-3). This blessing extended beyond the promise of personal wellbeing. It also enabled Abraham to become a blessing for others.

Old covenant: see explanation of Question 175.