 Finally, the promised child is born. Abraham has been waiting 25 years for his promised son, Isaac, from the years 75 to 100. He's completely incapable of having children. His wife, Sarah, is completely incapable of having children at the age of 90. And yet God causes them to have a child. The name Yitzchak means he will laugh. Just how could it even be? I mean, you're laughing with joy. And then God tests him.