Sarah finally became pregnant and gave birth to Isaac. The covenant promise of God could not be thwarted. Through Abraham, Isaac, and Isaac’s son Jacob the great nation of Israel was born. Israel was to be the people of God, the light to all people, and the lineage of the coming Messiah…Jesus Christ the Lord!
(Genesis 21) 1 Now the Lord was gracious to Sarah as he had said, and the Lord did for Sarah what he had promised. 2 Sarah became pregnant and bore a son to Abraham in his old age, at the very time God had promised him. 3 Abraham gave the name Isaac[a] to the son Sarah bore him. 4 When his son Isaac was eight days old, Abraham circumcised him, as God commanded him. 5 Abraham was a hundred years old when his son Isaac was born to him.
6 Sarah said, “God has brought me laughter, and everyone who hears about this will laugh with me.” 7 And she added, “Who would have said to Abraham that Sarah would nurse children? Yet I have borne him a son in his old age.” 8 The child grew and was weaned, and on the day Isaac was weaned Abraham held a great feast. (Genesis 21:1-8)