And Sarah saw the son of Hagar the Egyptian, whom she had borne unto Abraham, mocking.
All Commentaries on Genesis 21:9 Go To Genesis 21
Ephrem The Syrian
AD 373
Then the time came for Isaac to be born, and milk flowed in the breasts of the old woman. On the day of the great feast that Abraham prepared when he circumcised and weaned Isaac, Sarah noticed Ishmael playing. But Sarah also saw how much Ishmael shared the characteristics of his mother, for just as Sarah was despised in the eyes of Hagar, so too did Ishmael mock her son, and she thought, “If he acts thus to my son while I am still alive, perhaps [Abraham] will make him coheir with my son when I die and even give him two parts according to [the laws of] the firstborn.”