Hadithcore
Sunan Abi Dawud, 4001
sahih· Al-Albani

Narrated Umm Salamah, Ummul Mu'minin:

The Messenger of Allah (ﷺ) used to recite: "In the name of Allah, the Cherisher and Sustainer of the worlds; most Gracious, most Merciful; Master of the Day of Judgment," breaking its recitation into verses, one after another. Abu Dawud said: I heard Ahmad (b. Hanbal) say: The early reading is: Maliki yawmi'l-din.

حَدَّثَنَا سَعِيدُ بْنُ يَحْيَى الأُمَوِيُّ، حَدَّثَنِي أَبِي، حَدَّثَنَا ابْنُ جُرَيْجٍ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي مُلَيْكَةَ، عَنْ أُمِّ سَلَمَةَ، أَنَّهَا ذَكَرَتْ - أَوْ كَلِمَةً غَيْرَهَا - قِرَاءَةَ رَسُولِ اللَّهِ صلى الله عليه وسلم ‏{‏ بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ * الْحَمْدُ لِلَّهِ رَبِّ الْعَالَمِينَ * الرَّحْمَنِ الرَّحِيمِ * مَلِكِ يَوْمِ الدِّينِ ‏}‏ يَقْطَعُ قِرَاءَتَهُ آيَةً آيَةً ‏.‏ قَالَ أَبُو دَاوُدَ سَمِعْتُ أَحْمَدَ يَقُولُ الْقِرَاءَةُ الْقَدِيمَةُ ‏{‏ مَالِكِ يَوْمِ الدِّينِ ‏}‏ ‏.‏

References2 variants
In-Book Reference
Book 32, Hadith 33
English Reference
Book 31, Hadith 3990