Sahih Adab al-Mufrad

It is narrated from Sayyiduna Anas (may Allah be pleased with him): A Jewish woman brought poisoned meat of a goat to the service of the Prophet (peace and blessings of Allah be upon him). The Prophet (peace and blessings of Allah be upon him) ate from that meat. (When the matter became known,) the woman was brought (before him). It was said to the Prophet (peace and blessings of Allah be upon him): Should we not kill this Jewish woman? The Prophet (peace and blessings of Allah be upon him) said: "No." Sayyiduna Anas (may Allah be pleased with him) says: I always used to see the effect of that poison on the throat (uvula) of the Prophet (peace and blessings of Allah be upon him).