Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، حَدَّثَنَا اللَّيْثُ، حَدَّثَنِي سَعِيدٌ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ قَالَ لَمَّا فُتِحَتْ خَيْبَرُ أُهْدِيَتْ لِرَسُولِ اللَّهِ صلى الله عليه وسلم شَاةٌ فِيهَا سُمٌّ.Narrated Abu Huraira:When Khaibar was conquered, a (cooked) sheep containing poison, was given as a present to Allah's Apostle
From Sahih al-Bukhari, whose reports the scholars accept as authentic.