Asim bin Umar bin Qatadah says that the Messenger of Allah (peace and blessings be upon him) said: "Indeed, the angels have washed your companion," meaning Hanzalah (may Allah be pleased with him), "so ask his family what his situation was." His wife was asked, and she said: When he heard the cry of alarm, he went out while in a state of major ritual impurity (janabah). So the Messenger of Allah (peace and blessings be upon him) said: "That is why the angels washed him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6815