Sunan Abi Dawud, Hadith 1491 ⓘ
'Asma daughter of Yazid reported the Prophet as saying: "Allah's Greatest Names is in these two verses: "And your Ilaah (God) is One Ilaah (God), none has the right to be worshipped but He, the Ever-Merciful, the Mercy-Giving' and the beginning of Surah Al 'Imran, "A.L.M Allah, there is no deity but He, the Living, the Eternal."
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا عِيسَى بْنُ يُونُسَ، حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ أَبِي زِيَادٍ، عَنْ شَهْرِ بْنِ حَوْشَبٍ، عَنْ أَسْمَاءَ بِنْتِ يَزِيدَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ " اسْمُ اللَّهِ الأَعْظَمُ فِي هَاتَيْنِ الآيَتَيْنِ { وَإِلَهُكُمْ إِلَهٌ وَاحِدٌ لاَ إِلَهَ إِلاَّ هُوَ الرَّحْمَنُ الرَّحِيمُ } وَفَاتِحَةُ سُورَةِ آلِ عِمْرَانَ { الم * اللَّهُ لاَ إِلَهَ إِلاَّ هُوَ الْحَىُّ الْقَيُّومُ } .
also referenced under: Hadith 1496 (DarusSalam) & Book 8, Hadith 1491 (USC-MSA)