When this verse was revealed, "Say, come, let us call our sons and your sons" [Al Imran 3:61], the Messenger of Allah ﷺ called Ali, Fatimah, Hasan, and Husayn, and said, "Allah, these are my family."
لما نزلت هذه الآية: {فقل تعالو ندع أبناءنا وأبناءكم} دعا رسول الله ﷺ عليا وفاطمة وحسنا وحسينا فقال: اللهم هؤلاء أهلي.
Muslim narrated it in the Merits of the Companions (2404:32) through several routes from Hatim bin Ismail, from Bukayr bin Mismar, from Amir bin Saad bin Abu Waqqas, from his father, who said, and he related it. The hadith in full is recorded in the Merits of the Companions.