Narrated Usamah bin Zaid:"I came to the Prophet (ﷺ) one night concerning some need, so the Prophet (ﷺ) came out while he was covering up something, and I did not know what it was. Once I had tended to my need, I said: 'What is this that you were covering up?' So he uncovered it, and I found it was Hasan and Husain [peace be upon them] upon his hips. So he said: 'These are my two sons, and the sons of my daughter. O Allah! Indeed, I love them, so love them, and love those who love them

English translation · Jami' at-Tirmidhi