ENOfficial
Ibn Abi Mulaika reported: Ya'la ibn Mamlak asked Umm Salama about the Qur’anic recitation of Allah’s Messenger (Allah bless him and give him peace), whereupon she described a Qur’anic recitation that was explained letter by letter.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، قَالَ: حَدَّثَنَا اللَّيْثُ، عَنِ ابْنِ أَبِي مُلَيْكَةَ، عَنْ يَعَلَى بْنِ مَمْلَكٍ، أَنَّهُ سَأَلَ أُمَّ سَلَمَةَ، عَنْ قِرَاءَةِ رَسُولِ اللهِ صلى الله عليه وسلم، فَإِذَا هِيَ تَنْعَتُ قِرَاءَةً مُفَسَّرَةً حَرْفًا حَرْفًا.
sunnah.com