Sahih Bukhari Volume 3, Book 41, Hadith 2325

حَدَّثَنى مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا غُنْدَرٌ، حَدَّثَنَا شُعْبَةُ، عَنْ سَعْدٍ، سَمِعْتُ أَبَا سَلَمَةَ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏"‏ بَيْنَمَا رَجُلٌ رَاكِبٌ عَلَى بَقَرَةٍ الْتَفَتَتْ إِلَيْهِ‏.‏ فَقَالَتْ لَمْ أُخْلَقْ لِهَذَا، خُلِقْتُ لِلْحِرَاثَةِ، قَالَ آمَنْتُ بِهِ أَنَا وَأَبُو بَكْرٍ وَعُمَرُ، وَأَخَذَ الذِّئْبُ شَاةً فَتَبِعَهَا الرَّاعِي، فَقَالَ الذِّئْبُ مَنْ لَهَا يَوْمَ السَّبُعِ، يَوْمَ لاَ رَاعِيَ لَهَا غَيْرِي‏.‏ قَالَ آمَنْتُ بِهِ أَنَا وَأَبُو بَكْرٍ وَعُمَرُ ‏"‏‏.‏ قَالَ أَبُو سَلَمَةَ مَا هُمَا يَوْمَئِذٍ فِي الْقَوْمِ‏

Narrated By Abu Huraira : The Prophet said, "While a man was riding a cow, it turned towards him and said, 'I have not been created for this purpose (i.e. carrying), I have been created for ploughing." The Prophet added, "I, Abu Bakr and 'Umar believe in the story." The Prophet went on, "A wolf caught a sheep, and when the shepherd chased it, the wolf said, 'Who will be its guard on the day of wild beasts, when there will be no shepherd for it except me?' "After narrating it, the Prophet said, "I, Abu Bakr and 'Umar too believe it." Abu Salama (a sub-narrator) said, "Abu Bakr and 'Umar were not present then."