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.
Here we see again Abraham's great faith. He believed God's promise, no matter what else came along, no matter what else God would tell him to do; Abraham was going to stand firm in the promise. He knew that what God said -- He did.
The story of Abraham taking his son to the mountain to offer as a sacrifice, has been told for ages. It has almost become the key example of faith and obedience, which go hand in hand. You cannot have faith without obedience. James puts it this way, "...faith without works is dead, being alone."
Abraham was dedicated to obedience to God. Abraham was also a father that was so full of faith, that he staked the very life of his son, whom he loved, on that faith. His belief in who God was, was paramount in his life.