عَنْ كَثِيرِ بْنِ مُرَّةَ عَنْ مُعَاذِ بْنِ جَبَلٍ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ لَنَا مُعَاذٌ فِي مَرَضِهِ: قَدْ سَمِعْتُ مِنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ شَيْئًا كُنْتُ أَكْتُمُكُمُوهُ، سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يَقُولُ: ((مَنْ كَانَ آخِرُ كَلَامِهِ لَا إِلَهَ إِلَّا اللَّهُ وَجَبَتْ لَهُ الْجَنَّةُ))
Kathir bin Murrah says: Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) said to us during his illness of death: I heard a statement from the Messenger of Allah (peace and blessings be upon him), which I have kept hidden from you until now. I heard the Messenger of Allah (peace and blessings be upon him) say: Whoever's last words are "La ilaha illallah" (There is no god but Allah), Paradise will become obligatory for him.