It is narrated from Sayyiduna Sabit (may Allah be pleased with him) (the father of Abdur-Rahman) that the Messenger of Allah (peace and blessings be upon him) said: "When one of you is struck by a calamity, let him remember the calamity of (losing) me, for it is the greatest of calamities for him."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6688