AHMAD-ZUHD 81: from Bilāl b. al-Ḥārith al-Muzanī —
[Machine] The Messenger of Allah ﷺ said, "Indeed, a person may speak a word that brings about the pleasure of Allah, thinking that it will not reach the level of what it actually attains, but Allah will write His pleasure for him with that word until the day he meets Him. And indeed, a person may speak a word that brings about the anger of Allah, thinking that it will not reach the level of what it actually attains, but Allah will write His anger upon him with that word until the Day of Resurrection." Alqamah said, "How many words have been prohibited for me due to the hadith of Bilal bin Al-Harith!"

الزهد لأحمد ٨١: عن بلال بن الحارث المزني —
قَالَ رَسُولُ اللَّهِ ﷺ «إِنَّ الرَّجُلَ لَيَتَكَلَّمُ بِالْكَلِمَةِ مِنْ رِضْوَانِ اللَّهِ ﷻ مَا يَظُنُّ أَنَّهَا تَبْلُغُ مَا بَلَغَتْ يَكْتُبُ اللَّهُ ﷻ لَهُ بِهَا رِضْوَانَهُ إِلَى يَوْمِ يَلْقَاهُ وَإِنَّ الرَّجُلَ لَيَتَكَلَّمُ بِالْكَلِمَةِ مِنْ سَخَطِ اللَّهِ مَا يَظُنُّ أَنْ تَبْلُغَ مَا بَلَغَتْ يَكْتُبُ اللَّهُ بِهَا عَلَيْهِ سَخَطَهُ إِلَى يَوْمِ الْقِيَامَةِ» قَالَ فَكَانَ عَلْقَمَةُ يَقُولُ كَمْ مِنْ كَلَامٍ قَدْ مَنَعَنِيهِ حَدِيثُ بِلَالِ بْنِ الْحَارِثِ


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Aḥmad's Zuhd > Asceticism of the Messenger ﷺ
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