Sahih Al Bukhari 1: Chapter 3, Hadith 92

(92) To be furious while preaching or teaching if one sees what one hates

حَدَّثَنَا مُحَمَّدُ بْنُ الْعَلَاءِ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ حَدَّثَنَا أَبُو أُسَامَةَ، ‏‏‏‏‏‏عَنْ بُرَيْدٍ، ‏‏‏‏‏‏عَنْ أَبِي بُرْدَةَ، ‏‏‏‏‏‏عَنْ أَبِي مُوسَى، ‏‏‏‏‏‏قَالَ:‏‏‏‏ سُئِلَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَنْ أَشْيَاءَ كَرِهَهَا، ‏‏‏‏‏‏فَلَمَّا أُكْثِرَ عَلَيْهِ غَضِبَ، ‏‏‏‏‏‏ثُمَّ قَالَ لِلنَّاسِ:‏‏‏‏ "سَلُونِي عَمَّا شِئْتُمْ، ‏‏‏‏‏‏قَالَ رَجُلٌ:‏‏‏‏ مَنْ أَبِي؟ قَالَ:‏‏‏‏ أَبُوكَ حُذَافَةُ، ‏‏‏‏‏‏فَقَامَ آخَرُ، ‏‏‏‏‏‏فَقَالَ:‏‏‏‏ مَنْ أَبِي يَا رَسُولَ اللَّهِ؟ فَقَالَ:‏‏‏‏ أَبُوكَ سَالِمٌ مَوْلَى شَيْبَةَ، ‏‏‏‏‏‏فَلَمَّا رَأَى عُمَرُ مَا فِي وَجْهِهِ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ يَا رَسُولَ اللَّهِ، ‏‏‏‏‏‏إِنَّا نَتُوبُ إِلَى اللَّهِ عَزَّ وَجَلَّ".

SAHIH HADITH:

Narrated Abu Musa: The Prophet was asked about things which he did not like, but when the questioners insisted, the Prophet got angry. He then said to the people, Ask me anything you like. A man asked, Who is my father? The Prophet replied, Your father is Hudhafa. Then another man got up and said, Who is my father, O Allah's Apostle ? He replied, Your father is Salim, Maula (the freed slave) of Shaiba. So when `Umar saw that (the anger) on the face of the Prophet he said, O Allah's Apostle! We repent to Allah (Our offending you).

REFERENCE:

Sahih Al Bukhari 1: Chapter 3, Hadith 92