A Jewess brought a poisoned sheep to the Messenger of Allah (ﷺ), and he ate of it. She was then brought to the Messenger of Allah (ﷺ) who asked her about it. She said: I intended to kill you. He said: Allah will not give you control over it ; or he said : over me. They (the Companions) said: Should we not kill her ? He said: No. He (Anas) said: I always found it in the uvula of the Messenger of Allah (ﷺ)
Sunan Abi Dawud Book 41, Hadith 15