Umm Fadl bint Harith heard him reciting "By those sent forth" [Mursalat 77:1], and she said, "My son, your recitation of this surah has reminded me. It was the last thing I heard the Messenger of Allah ﷺ recite, he recited it in the Maghrib prayer."
إن أم الفضل بنت الحارث سمعته وهو يقرأ: {والمرسلت} فقالت: يا بني، لقد ذكرتني بقراءتك هذه السورة، إنها لآخر ما سمعت من رسول الله ﷺ يقرأ بها في المغرب.
Malik narrated it in "the Prayer" (24) from Ibn Shihab, from Ubaydullah bin Abdullah bin Utba bin Masud, from Abdullah bin Abbas, and he mentioned it. And from Malik, Bukhari narrated it in "the Adhan" (763) and Muslim in "the Prayer" (462).Bukhari also narrated it in "the Maghazi" (4429), and Muslim, both of them through routes from Zuhri other than the narration of Malik, and in it, "Then he did not lead us in prayer after that until Allah took him." That is, it was the last of the prayers the Messenger of Allah ﷺ led, namely Maghrib. It will come later in the hadith of Ayesha, in the chapter "Who has the most right to lead the prayer," that the last prayer the Messenger of Allah ﷺ and his family prayed was Dhuhr. The two sahih hadiths can be reconciled by saying that he prayed Dhuhr with Abu Bakr in the masjid, and he prayed Maghrib with his family in his house. So Umm Fadl is recounting what he prayed in his house, while Ayesha is recounting what he prayed in the masjid.As for what was narrated from Anas bin Malik, from Umm Fadl bint Harith, who said, "The Messenger of Allah ﷺ led us in Maghrib in his house, and he recited Mursalat. He did not pray again until he passed away ﷺ," the sahih version is from the hadith of Ibn Abbas, as already mentioned.As for this narration, Musa bin Dawud reported it, he said, Abdul-Aziz bin Abu Salama Majishun narrated to us, from Humayd, from Anas, and he mentioned it. And through his route, Nasai narrated it (985), and Ahmad (26871), and Tahawi in his commentary (1228). Abu Hatim and Abu Zura pointed out this error in Ilal of Ibn Abu Hatim (1/84-85), noting that Musa bin Dawud, who is Dabbi, had mixed one hadith into another.So the Prophet's ﷺ recitation of Surah Mursalat in Maghrib is from the hadith of Ibn Abbas, from Umm Fadl, while the Prophet's ﷺ praying wrapped in a garment is the hadith of Anas, so take note.