Have not withheld your son, your only son - blessing I will bless you, and multiplying I will multiply

Genesis 22:16-17
By Myself I have sworn, says the Lord, because you have done this thing, and have not withheld your son, your only son— 17 blessing I will bless you, and multiplying I will multiply your descendants as the stars of the heaven and as the sand which is on the seashore; and your descendants shall possess the gate of their enemies.

Incredible blessings has been bestowed upon Abraham when Abraham acted out his faith in allowing his only son, and through all God's promises would come, to be sacrificed. The extend of his faith is even more incredible when lokking at various circumstances. Firstly, the God he was serving, had never before asked for human sacrifice. Secondly, he knew somehow God would resurrect his son, even though that also had not been done before. Thirdly, all of God promises was based on Isaac and not any other son. So Abraham was a man shown to be totally trusting of his God. The promises of God came to pass for Abraham because he was obedient to God.