The Order to Sacrifice Ismail
“And when he (Ismail) was old enough to walk with him (Ibrahim (AS)), he said: ‘O my son! I have seen in a vision that I offer thee in sacrifice: Now see what is thy view!” He said: ‘O my father! Do that which you are Commanded, Insha’Allah (if Allah wills), you shall find me of as-Sabirin (the patient ones).’ Then, when they had both submitted themselves (to the Will of Allah), he had laid him prostrate on his forehead (or on the side of his forehead for slaughtering); and We called out to him: ‘O Ibrahim! You have fulfilled the vision!’ Verily, Thus, do We reward the Muhsinun (good-doers). Verily, that indeed was a manifest trial. And We ransomed him with a great sacrifice (a ram). And We left for him (a goodly remembrance) among generations (to come) in later times. ‘Salam (peace) be upon Ibrahim’. Thus indeed We reward the Muhsinin.”
[Surah Al Saffat 37:102-105]