It is narrated from Ibn Shihab al-Zuhri that one day a man gave Sayyiduna Abu Bakr (may Allah be pleased with him) a dish made of meat and flour (khazirah) as a gift. With him at that time was al-Harith bin Kaladah, who had knowledge of medicine. When the two of them had eaten some of it, al-Harith bin Kaladah said: In it is a poison that takes effect within a year. By the One in whose hand my soul is! The year had not yet ended when both of them died on the same day at the end of the year.

It is narrated from Imam al-Sha'bi (may Allah have mercy on him) that he said: What can now be expected from this lowly world, when the Messenger of Allah (peace and blessings be upon him) was poisoned, Abu Bakr al-Siddiq (may Allah be pleased with him) was poisoned, Umar (may Allah be pleased with him) was martyred, likewise Uthman and Ali (may Allah be pleased with them both) were martyred, al-Hasan (may Allah be pleased with him) was poisoned, and al-Husayn (may Allah be pleased with him) was martyred.