E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Poison of Khaïbar
refers to the poisoned leg of mutton of which Mahomet partook while in the citadel of Khaïbar. It was poisoned by Zaïnab, a Jewess, and Mahomet felt the effects of the poison to the end of his life.