Asma bint Yazid narrated that the Prophet (ﷺ) said:
“Allah's greatest name is in these two Ayah: ‘And your deity is One deity, there is none who has the right to be worshipped but He, Ar-Raḥmān, Ar-Raḥīm.’ And the Opening of Al-`Imrān: ‘Alif. Lām. Mīm. Allah, None has the right to be worshipped but He, the Ever living, the Sustainer.’”
Reference: Jami` at-Tirmidhi 3478 In-book : Book 48, Hadith 109 English translation : Vol. 6, Book 45, Hadith 3478
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