Sayyiduna Usama bin Zaid (may Allah be pleased with them both) narrates: Once, due to some work, I came to the service of the Prophet Muhammad (peace be upon him) at night. The Prophet (peace be upon him) was holding something; I could not figure out what it was. When I finished my work, I asked: What is this thing, upon which you (peace be upon him) have placed a sheet? The Prophet (peace be upon him) removed the sheet, and it was Sayyiduna Hasan (may Allah be pleased with him) and Sayyiduna Husain (may Allah be pleased with him), who were sitting on his (peace be upon him) lap. The Prophet (peace be upon him) said: These two are my sons and my daughter's sons. O Allah! Surely You know that I love both of them, so You also love both of them.