The Book of Faith
1/10. Chapter:
The evidence that one who dies believing in tawhid will definitely enter paradise
Sahih Muslim
حَدَّثَنَا مُحَمَّدُ بْنُ أَبِي بَكْرٍ الْمُقَدَّمِيُّ، حَدَّثَنَا بِشْرُ بْنُ الْمُفَضَّلِ، حَدَّثَنَا خَالِدٌ الْحَذَّاءُ، عَنِ الْوَلِيدِ أَبِي بِشْرٍ، قَالَ سَمِعْتُ حُمْرَانَ، يَقُولُ سَمِعْتُ عُثْمَانَ، يَقُولُ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ مِثْلَهُ سَوَاءً .
It is narrated on the authority of Humran that he heard Uthman saying this: I heard the Messenger of Allah (ﷺ) uttering these words (as stated above).
Reference : Sahih Muslim 26bIn-book reference : Book 1, Hadith 44USC-MSA web (English) reference : Book 1, Hadith 40