حَدَّثَنِي مَالِكٌ، عَنْ مُحَمَّدِ بْنِ عَمْرِو بْنِ عَلْقَمَةَ، عَنْ أَبِيهِ، عَنْ بِلاَلِ بْنِ الْحَارِثِ الْمُزَنِيِّ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ إِنَّ الرَّجُلَ لَيَتَكَلَّمُ بِالْكَلِمَةِ مِنْ رِضْوَانِ اللَّهِ مَا كَانَ يَظُنُّ أَنْ تَبْلُغَ مَا بَلَغَتْ يَكْتُبُ اللَّهُ لَهُ بِهَا رِضْوَانَهُ إِلَى يَوْمِ يَلْقَاهُ وَإِنَّ الرَّجُلَ لَيَتَكَلَّمُ بِالْكَلَمِةِ مِنْ سَخَطِ اللَّهِ مَا كَانَ يَظُنُّ أَنْ تَبْلُغَ مَا بَلَغَتْ يَكْتُبُ اللَّهُ لَهُ بِهَا سَخَطَهُ إِلَى يَوْمِ يَلْقَاهُ ‏"‏ ‏.‏

Malik related to me from Muhammad ibn Amr ibn Alqama from hisfather from Bilal ibn al-Harith al-Muzani that the Messenger of Allah,may Allah bless him and grant him peace, said, "A man speaks what ispleasing to Allah and he does not suspect that it will have the resultthat it does, and Allah will write for him His good pleasure for ituntil the day when he meets Him. And a man speaks what excites thewrath of Allah and he does not suspect that it will have the resultthat it does, and Allah will write His wrath for him for it until theday when he meets Him." Translation Not Available

Book reference: Muwatta Imam Malik Book 56 Hadith 1818
Web reference: Muwatta Imam Malik Book 56 Hadith 5