Full Sharh — Musnad Ahmad 419
حَدَّثَنَا عَبْدُ الْوَهَّابِ الْخَفَّافُ، حَدَّثَنَا سَعِيدٌ، عَنْ قَتَادَةَ، عَنْ مُسْلِمِ بْنِ يَسَارٍ، عَنْ حُمْرَانَ بْنِ أَبَانَ، أَنَّ عُثْمَانَ بْنَ عَفَّانَ، رَضِيَ اللَّهُ عَنْهُ قَالَ سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ إِنِّي لَأَعْلَمُ كَلِمَةً لَا يَقُولُهَا عَبْدٌ حَقًّا مِنْ قَلْبِهِ إِلَّا حُرِّمَ عَلَى النَّارِ فَقَالَ لَهُ عُمَرُ بْنُ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُ أَنَا أُحَدِّثُكَ مَا هِيَ هِيَ كَلِمَةُ الْإِخْلَاصِ الَّتِي أَعَزَّ اللَّهُ تَبَارَكَ وَتَعَالَى بِهَا مُحَمَّدًا صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَأَصْحَابَهُ وَهِيَ كَلِمَةُ التَّقْوَى الَّتِي أَلَاصَ عَلَيْهَا نَبِيُّ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَمَّهُ أَبَا طَالِبٍ عِنْدَ الْمَوْتِ شَهَادَةُ أَنْ لَا إِلَهَ إِلَّا اللَّهُ.
English Translation
It was narrated from Hurman bin Aban that `Uthman bin `Affan (رضي الله عنه) said:: I heard the Messenger of Allah (ﷺ) say: `I know a word which no one says, sincerely from the heart, but he will be forbidden to the Fire.” `Umar bin al-Khattab (رضي الله عنه) said to him: I will tell you what it is: it is the word of al-ikhlas by means of which Allah, may He be blessed and exalted, caused Muhammad (ﷺ) and his companions to prevail and it is the word of taqwa that the Prophet (ﷺ) of Allah urged his uncle Abu Talib to say when he was dying, the testimony that there is no god but Allah.
Source
Musnad Ahmad(مسند أحمد)
Musnad Uthman ibn Affan
Hadith Number
419