Sayyiduna Abdullah bin Ja'far (may Allah be pleased with them both) narrated: When the news of the death of Sayyiduna Ja'far (may Allah be pleased with him) came, the Messenger of Allah (peace and blessings be upon him) said: "Prepare food for the family of Ja'far, for something has befallen them that has kept them occupied."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1459