Salim bin Abi al-Ja'd narrated: the Messenger of Allah (peace and blessings be upon him) was shown the Companions of Mu'tah in a dream, and he (peace and blessings be upon him) saw Sayyiduna Ja'far (may Allah be pleased with him) as an angel with two wings, both wings stained with blood, that is, dyed.
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1460