Genesis 21:6-8

Sarah said, “God has made me laugh; all who hear [about our good news] will laugh with me.” And she said, “Who would have said to Abraham that Sarah would nurse children? For I have given birth to a son by him in his old age.” [Heb 11:12] The child [Isaac] grew and was weaned, and Abraham held a great feast on the day that Isaac was weaned.