Narrated Anas bin Malik:
“Once Muadh was along with Allah’s Messenger (ﷺ) as a companion rider. Allah’s Messenger (ﷺ) said, “O Muadh bin Jabal.” Muadh replied, “Labbaik and Sadaik. O Allah’s Messenger (ﷺ)!” Again the Prophet (ﷺ) said, “O Muadh!” Muadh said thrice, “Labbaik and Sadaik, O Allah’s Messenger (ﷺ)!” Allah’s Messenger (ﷺ) said, “There is none who testifies sincerely that none has the right to be worshipped but Allah and Muhammad is his Apostle, except that Allah, will save him from the Hell-fire.” Muadh said, “O Allah’s Messenger (ﷺ) ! Should I not inform the people about it so that they may have glad tidings?” He replied, “When the people hear about it, they will solely depend on it.” Then Mu`adh narrated the above-mentioned Hadith just before his death, being afraid of committing sin (by not telling the knowledge).
حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا مُعَاذُ بْنُ هِشَامٍ، قَالَ حَدَّثَنِي أَبِي، عَنْ قَتَادَةَ، قَالَ حَدَّثَنَا أَنَسُ بْنُ مَالِكٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم وَمُعَاذٌ رَدِيفُهُ عَلَى الرَّحْلِ قَالَ ” يَا مُعَاذُ بْنَ جَبَلٍ ”. قَالَ لَبَّيْكَ يَا رَسُولَ اللَّهِ وَسَعْدَيْكَ. قَالَ ” يَا مُعَاذُ ”. قَالَ لَبَّيْكَ يَا رَسُولَ اللَّهِ وَسَعْدَيْكَ. ثَلاَثًا. قَالَ ” مَا مِنْ أَحَدٍ يَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ وَأَنَّ مُحَمَّدًا رَسُولُ اللَّهِ صِدْقًا مِنْ قَلْبِهِ إِلاَّ حَرَّمَهُ اللَّهُ عَلَى النَّارِ ”. قَالَ يَا رَسُولَ اللَّهِ، أَفَلاَ أُخْبِرُ بِهِ النَّاسَ فَيَسْتَبْشِرُوا قَالَ ” إِذًا يَتَّكِلُوا ”. وَأَخْبَرَ بِهَا مُعَاذٌ عِنْدَ مَوْتِهِ تَأَثُّمًا .
Reference : Sahih al-Bukhari 128
In-book reference : Book 3, Hadith 70
USC-MSA web (English) reference : Vol. 1, Book 3, Hadith 130