The LORD visited Sarah as he had said, and the LORD did to Sarah as he had promised. And Sarah conceived and bore Abraham a son in his old age at the time of which God had spoken to him.
Abraham called the name of his son who was born to him, whom Sarah bore him, Isaac. And Abraham circumcised his son Isaac when he was eight days old, as God had commanded him.
Abraham was a hundred years old when his son Isaac was born to him. And Sarah said, “God has made laughter for me; everyone who hears will laugh over me.” And she said, “Who would have said to Abraham that Sarah would nurse children? Yet I have borne him a son in his old age.”
And the child grew and was weaned. And Abraham made a great feast on the day that Isaac was weaned.
Genesis 21 : 1 – 8 (English Standard Version)
“Few under the Old Testament were brought into the world with such expectations as Isaac.
He was in this a type of Christ, that Seed which the holy God so long promised, and holy men so long expected. He was born according to the promise, at the set time of which God had spoken.
God’s promised mercies will certainly come at the time which He sets, and that is the best time. Isaac means “laughter,” and there was good reason for the name, 17; 18:13. When the Sun of comfort is risen upon the soul, it is good to remember how welcome the dawning of the day was. When Sarah received the promise, she laughed with distrust and doubt. When God gives us the mercies we began to despair of, we ought to remember with sorrow and shame our sinful distrust of his power and promise, when we were in pursuit of them.
This mercy filled Sarah with joy and wonder. God’s favours to his covenant people are such as surpass their own and others’ thoughts and expectations: who could imagine that he should do so much for those that deserve so little, nay, for those that deserve so ill?
Who would have said that God should send his Son to die for us, his Spirit to make us holy, his angels to attend us? Who would have said that such great sins should be pardoned, such mean services accepted, and such worthless worms taken into covenant?
A short account of Isaac’s infancy is given. God’s blessing upon the nursing of children, and the preservation of them through the perils of the infant age, are to be acknowledged as signal instances of the care and tenderness of the Divine providence. See Psalm 22:9,10; Hosea 11:1,2.”#
#Taken From Matthew Henry’s Concise Commentary.
