ENOfficial
Abu Sa'id and Abu Huraira reported God's messenger as saying, “Recite to those of you who are dying, ‘There is no god but God. ’ ” Muslim transmitted it.
Source: sunnah.com
Other translations
Arabic
عَنْ أَبِي سَعِيدٍ وَأَبِي هُرَيْرَةَ قَالَا: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَقِّنُوا مَوْتَاكُمْ لَا إِلَهَ إِلَّا اللَّهُ» . رَوَاهُ مُسْلِمٌ
sunnah.com