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
Hadith Referenceصحيح مسلم / كتاب الإيمان / 26
Hadith Gradingمحدثین:أحاديث صحيح مسلم كلها صحيحة
Hadith Takhrij«أحاديث صحيح مسلم كلها صحيحة ، انفرد به مسلم - انظر ((تحفة الاشراف)) برقم (9798) »
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).
Hadith Referenceصحيح مسلم / كتاب الإيمان / 26
Hadith Gradingمحدثین:أحاديث صحيح مسلم كلها صحيحة
Hadith Takhrij«أحاديث صحيح مسلم كلها صحيحة ، انفرد به مسلم - انظر ((التحفة)) برقم (9798) »
Abu Sa'id al-Khudri reported: We used to estimate how long Allah's Messenger (ﷺ) stood in the noon and afternoon prayers, and we estimated that he stood in the first two rak'ahs of the noon prayer as long as it takes to recite Alif Lam Mim, Tanzil, i. e. as-Sajda. We estimated that he stood half that time in the last two rak'ahs; that he stood in the first two of the afternoon as long as he did in the last two at noon; and in the last two of the afternoon prayer about half that time. Abu Bakr (RA) in his narration has made no mention of Alif Lam Mim, Tanzil, but said: As long as it takes to recite thirty verses.
Abu Sa'id al-Khudri reported: The Apostle of Allah (ﷺ) used to recite in every rak'ah of the first two rak'ahs of the noon prayer about thirty verses and in the last two about fifteen verses or half (of the first rak'ah) and in every rak'ah of the 'Asr prayer of the first two rak'ahs about fifteen verses and in the last two verses half (of the first ones).