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 ‏}‏ ‏.‏

'Asma daughter of Yazid reported the Prophet (PBUH) 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." Translation Not Available

Book Ref: Sunan Abi Dawud Book 8 Hadith 1496
Web Ref:  Sunan Abi Dawud Book 8 Hadith 1491