Umair bin Ishaq narrates: I was present with Sayyiduna Abu Hurairah (may Allah be pleased with him). He said to Sayyiduna Imam Hasan bin Ali (may Allah be pleased with him): Show me the place where I saw the Prophet (peace and blessings be upon him) kiss you. So Sayyiduna Imam Hasan (may Allah be pleased with him) removed the cloth from his navel, and Sayyiduna Abu Hurairah (may Allah be pleased with him) kissed it.

The narrator named Shareek states: If the navel were part of the private area, Sayyiduna Imam Hasan (may Allah be pleased with him) would not have exposed it.