Hebrews 11:17-19

By faith Abraham, when God tested him, offered Isaac as a sacrifice. He who had received the promises was about to sacrifice his one and only son, even though God had said to him, "It is through Isaac that your offspring will be reckoned." Abraham reasoned that God could raise the dead, and figuratively speaking, he did receive Isaac back from death.

By faith Abraham, when God tested him, offered Isaac as a sacrifice
Genesis 22:9-10 When they reached the place God had told him about, Abraham built an altar there and arranged the wood on it. He bound his son Isaac and laid him on the altar, on top of the wood. Then he reached out his hand and took the knife to slay his son.
James 2:21 Was not our ancestor Abraham considered righteous for what he did when he offered his son Isaac on the altar?

even though God had said to him, "It is through Isaac that your offspring will be reckoned."
Genesis 21:12 But God said to him, "Do not be so distressed about the boy and your maidservant. Listen to whatever Sarah tells you, because it is through Isaac that your offspring will be reckoned."
Romans 9:7 Nor because they are his descendants are they all Abraham's children. On the contrary, "It is through Isaac that your offspring will be reckoned."

Abraham reasoned that God could raise the dead
Romans 4:20-21 Yet he did not waver through unbelief regarding the promise of God, but was strengthened in his faith and gave glory to God, being fully persuaded that God had power to do what he had promised.
John 5:21 "For just as the Father raises the dead and gives them life, even so the Son gives life to whom he is pleased to give it."
Genesis 22:11-12 But the angel of the LORD called out to him from heaven, "Abraham! Abraham!" "Here I am," he said. "Do not do anything to him. Now I know that you fear God, because you have not withheld from me your son, your only son."

NOTES:
Genesis 22
John 3:16
Romans 8:32
Read Galatians 3

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984 by International Bible Society. Used by permission. All rights reserved worldwide.