Sahih al-Bukhari 3037 (Book 58, Hadith 11)

Narrated Abu Huraira: When Khaibar was conquered, a roasted poisoned sheep was presented to the Prophet (ﷺ) as a gift (by
the Jews). The Prophet (ﷺ) ordered, “Let all the Jews who have been here, be assembled before me.” The
Jews were collected and the Prophet (ﷺ) said (to them), “I am going to ask you a question. Will you tell
the truth?” They said, “Yes.” The Prophet (ﷺ) asked, “Who is your father?” They replied, “So-and-so.” He
said, “You have told a lie; your father is so-and-so.” They said, “You are right.” He said, “Will you
now tell me the truth, if I ask you about something?” They replied, “Yes, O Abu Al-Qasim; and if we
should tell a lie, you can realize our lie as you have done regarding our father.” On that he asked,
“Who are the people of the (Hell) Fire?” They said, “We shall remain in the (Hell) Fire for a short
period, and after that you will replace us.” The Prophet (ﷺ) said, “You may be cursed and humiliated in it!
By Allah, we shall never replace you in it.” Then he asked, “Will you now tell me the truth if I ask you
a question?” They said, “Yes, O Abu Al-Qasim.” He asked, “Have you poisoned this sheep?” They
said, “Yes.” He asked, “What made you do so?” They said, “We wanted to know if you were a liar in
which case we would get rid of you, and if you are a prophet then the poison would not harm you.”