It is narrated from Sayyidah Aishah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) came to Uthman bin Maz'un (may Allah be pleased with him) when he had died. He (peace and blessings be upon him) uncovered his face, then bent over him, kissed him and wept, until I saw the tears of him (peace and blessings be upon him) flowing down his cheeks.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6712