26.01
It is narrated on the authority of 'Uthman that the Messenger of Allah (ﷺ) said. He who died knowing (fully well) that there is no god but Allah entered Paradise
Sahih MuslimHadith 26 (2 narrations)
26.02
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)