Yahya bin Abd al-Rahman bin Abi Labibah narrates from his grandfather (may Allah be pleased with him) that on the day of Khaybar a poisoned roasted goat was brought, which a Jewish woman had given. The Prophet (peace and blessings be upon him) and Bishr bin al-Bara (may Allah be pleased with him) ate from it, and both became seriously ill, and Bishr (may Allah be pleased with him) died. When Bishr (may Allah be pleased with him) died, the Prophet (peace and blessings be upon him) summoned the Jewish woman and asked: "Why did you do this?" She said: "So that it would be decided: if you are a prophet, no harm will come to you and Allah will save you, and if you are not a prophet, the people will be relieved of you." So by his (peace and blessings be upon him) order she was crucified.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنايات / 16012