Why did God tell Abraham to kill his son Isaac?

"Now it came about after these things, that God tested Abraham, and said to him, Abraham!' And he said, 'Here I am.' 2 And He said, 'Take now your son, your only son, whom you love, Isaac, and go to the land of Moriah; and offer him there as a burnt offering on one of the mountains of which I will tell you,'"(Gen. 22:1-2).

God told Abraham to kill his son Isaac because their actions are pointing ahead to the person of Christ in a typology of the true sacrifice. First of all, God says to Abraham to take his only son. But, we know that 13 years earlier Ishmael had been born to Abraham. So why would God call Isaac the only son? The answer becomes clear when we see what the Scriptures teach.

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