The Prophet ﷺ said, "The greatest name of Allah, by which when He is called He responds, is found in three surahs of the Quran, in al-Baqarah, Aal Imran, and Ta-Ha."
عن النبي ﷺ قال: اسم الله الأعظم الذي إذا دعي به أجاب في ثلاث سور من القرآن: في البقرة، وآل عمران، وطه.
Tahawi related it in Sharh Mushkil (176), Tabarani in al-Kabir (8/282), and Hakim (1/505–506), all of them through the route of Walid bin Muslim, who said, Abdullah bin Ala bin Zabr told me, Qasim bin Abdul-Rahman told us, from Abu Umama, and he mentioned it. The wording given is that of Tabarani. Hakim added, Qasim said, "So I searched for it and found it in Surah Baqarah in the Verse of the Throne, "Allah, there is no god but He, the Living, the Sustainer" [Baqarah 2:255], and in Surah Al Imran, "Alif Lam Meem. Allah, there is no god but He, the Living, the Sustainer" [Al Imran 3:1–2], and in Surah Taha, "And all faces shall be humbled before the Living, the Sustainer, and he who bears wrongdoing will indeed have failed" [Taha 20:111]."Its chain of transmission is hasan because of Qasim bin Abdul-Rahman, for he is hasan al-hadith. The discussion of this is set out at length in the book al-Adhkar.