God draws the line: 'But my covenant I will establish with Isaac, whom Sarah will bear to you by this time next year.' The 'but' is the covenant's clarity — Ishmael is blessed and provided for, but the covenant runs through Isaac. The distinction is not a rejection of Ishmael but a specification of the promise's trajectory. Galatians 4:22–23 uses this distinction theologically to describe two kinds of relationship with God — the son of the slave born in the ordinary human way, and the son of the free woman born through God's promise. The covenant line is supernatural, not natural; it runs through the promised child, not the planned child. The application: understanding the distinction between what God blesses and what God covenants is important. God can bless Ishmael generously while the covenant specifically runs through Isaac. Not everything God blesses is the covenant line.

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