Genesis 22:16-18

Because you have not withheld your son, your only son...I will make your descendants as numerous as the stars in the sky...because you have obeyed me...the moment of your greatest sacrifice will also be the precise moment of your greatest and most miraculous blessing. There is nothing God will not do for those who will dare to step out in faith onto what appears to be only a mist. As they take the first step, they will find a rock beneath their feet.