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Abraham recognized his other children by giving them gifts and sending them away, thereby making sure they couldn’t supplant Isaac as the rightful heir. Along with his father’s immense wealth (13:2; 23:6), Isaac also inherited the covenant blessings that God had given Abraham and Sarah (12:1-3; 13:14-18; 15:1-6). Isaac had parents who believed God and, in spite of occasional mistakes, tried to please Him.
Abraham’s firstborn son, Ishmael (chap. 16), wasn’t chosen to be the child of promise and the heir of the covenant blessings. God promised to bless Ishmael and make him a great nation, and He kept His promise (17:20-21; 25:12-16); “But my covenant will I establish with Isaac” (17:21; Rom. 9:6-13). Ishmael was on hand for his father’s funeral (Gen. 25:9), but he wasn’t included in the reading of his father’s will.
Ishmael pictures the “natural” or unsaved person (1 Cor. 2:14), who is outside the faith and hostile to the things of God. But Isaac pictures those who have trusted Jesus Christ and experienced the miraculous new birth by the power of God (1 Peter 1:22-23). “Now we, brethren, as Isaac was, are the children of promise” (Gal. 4:28). Ishmael was born a slave, but Isaac was born free (4:21-31; 5:1-2); and Ishmael was born poor, but Isaac was born rich. Every believer in Jesus Christ shares all the blessings of the Spirit in Christ (Eph. 1:3) and is part of Christ’s glorious inheritance (vv. 11, 18).
From the moment of birth, we’re all dependent on the older generation to care for us until we can care for ourselves. We’re also indebted to previous generations for guarding and handing down to us the knowledge, skills, traditions, and culture that are extremely important to daily life. Imagine what life would be like if each new generation had to devise the alphabet, invent printing, discover electricity, or design the wheel!
The most important part of Isaac’s legacy wasn’t the great material wealth his father had left him. Isaac’s most important legacy was the spiritual wealth from his father and mother: knowing and trusting the true and living God and being a part of the covenant blessings that God had graciously bestowed upon Abraham and Sarah and their descendants. How tragic it is when the children of devout Christian believers turn their backs on their priceless spiritual heritage and, like Ishmael and Esau, live for the world and the flesh instead of for the Lord!