Sahih Muslim
The Book on Salutations and Greetings (Kitab As-Salam)
Book Number: 026 / Hadith Number: 5430
Anas reported that a Jewess came to Allah's Messenger (may peace be upon him) with poisoned mutton and he took of that what had been brought to him (Allah's Messenger). (When the effect of this poison were felt by him) he called for her and asked her about that, whereupon she said: I had determined to kill you. Thereupon he said: Allah will never give you the power to do it. He (the narrator) said that they (the Companion's of the Holy Prophet) said: Should we not kill her? Thereupon he said: No. He (Anas) said: I felt (the affects of this poison) on the uvula of Aitah's Messenger.