Sahih Muslim Book - 1, Hadith - 148

حَدَّثَنَا إِسْحَاقُ بْنُ مَنْصُورٍ أَخْبَرَنَا مُعَاذُ بْنُ هِشَامٍ قَالَ حَدَّثَنِي أَبِي عَنْ قَتَادَةَ قَالَ حَدَّثَنَا أَنَسُ بْنُ مَالِكٍ أَنَّ نَبِيَّ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَمُعَاذُ بْنُ جَبَلٍ رَدِيفُهُ عَلَى الرَّحْلِ قَالَ يَا مُعَاذُ قَالَ لَبَّيْكَ رَسُولَ اللَّهِ وَسَعْدَيْكَ قَالَ يَا مُعَاذُ قَالَ لَبَّيْكَ رَسُولَ اللَّهِ وَسَعْدَيْكَ قَالَ يَا مُعَاذُ قَالَ لَبَّيْكَ رَسُولَ اللَّهِ وَسَعْدَيْكَ قَالَ مَا مِنْ عَبْدٍ يَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللَّهُ وَأَنَّ مُحَمَّدًا عَبْدُهُ وَرَسُولُهُ إِلَّا حَرَّمَهُ اللَّهُ عَلَى النَّارِ قَالَ يَا رَسُولَ اللَّهِ أَفَلَا أُخْبِرُ بِهَا النَّاسَ فَيَسْتَبْشِرُوا قَالَ إِذًا يَتَّكِلُوا فَأَخْبَرَ بِهَا مُعَاذٌ عِنْدَ مَوْتِهِ تَأَثُّمًا.

Anas bin Malik narrated that the Prophet of Allah (s.a.w) said - when Mu'adh was riding behind him on a mount - "O Mu'adh!" He said: "Here I am at your service, O Messenger of Allah." He said: "O Mu'adh!" He said: "Here I am at your service, O Messenger of Allah." He said: "O Mu'adh!" He said: "Here I am at your service, O Messenger of Allah." He said: "There is no one who bears witness that none has the right to be worshiped but Allah, and that Muhammad is His slave and Messenger, but Allah will forbid him to the Fire." He said: "O Messenger of Allah, should I not tell [the people] about it so that they may rejoice?" He said: "Rather they will (complacently) rely on it." So Mu'adh narrated it when he was dying, so as to absolve himself of responsibility.