Hebrews 11:18 (Read all of Hebrews 11)
even though God had said to him, "It is through Isaac that your offspring will be reckoned."
Hebrews 11:19 (Read all of Hebrews 11)
Abraham reasoned that God could even raise the dead, and so in a manner of speaking he did receive Isaac back from death.
Hebrews 11:20 (Read all of Hebrews 11)
By faith Isaac blessed Jacob and Esau in regard to their future.
James 2:21 (Read all of James 2)
Was not our father Abraham considered righteous for what he did when he offered his son Isaac on the altar?