Jami` at-Tirmidhi, Volume 6, Book 45, Hadith 3496 (DarusSalam) ⓘ
Aishah said: “I heard the Messenger of Allah saying at his death: ‘O Allah, forgive me and have mercy on me, and join me with the Highest Company (Allāhummaghfirlī warḥamnī wa alḥiqnī bir-rafīqil a`lā).’”
حَدَّثَنَا هَارُونُ بْنُ إِسْحَاقَ، حَدَّثَنَا عَبْدَةُ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ عَبَّادِ بْنِ عَبْدِ اللَّهِ بْنِ الزُّبَيْرِ، عَنْ عَائِشَةَ، قَالَتْ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ عِنْدَ وَفَاتِهِ " اللَّهُمَّ اغْفِرْ لِي وَارْحَمْنِي وَأَلْحِقْنِي بِالرَّفِيقِ الأَعْلَى " . قَالَ هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ .
also referenced under: Hadith 3496 (Reference) & Book 48, Hadith 127 (In-Book)