"He has asked Allah using His Greatest Name."

The Greatest Name of Allah, if He is called by which He will respond, is in three Surah: Al-Baqarah, Al 'Imran and Ta-Ha. (Hasan)Another chain for something similar from Al-Qasim, from Abu Umamah, from the Prophet (saas).

"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."

the Messenger of Allah (saas) said: "The Greatest Name of Allah is in these two Verses: And your Ilah (God) is One Ilah (God - Allah), La Ilaha Illa Huwa (none has the right to be worshipped but He), the Most Gracious, the Most Merciful.' And at the beginning of Surah Al 'Imran."

“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.’”

Asma’ daughter of Yazid reported the Prophet as saying, “God’s greatest name is in these two verses, ‘And your God is one God; there is no god but He, the Compassionate, the Merciful’ [Qur'an, ii, 163.], and the beginning of Al 'Imran, ‘A.L.M. God, there is no god but He, the Living, the Eternal’ [Qur'an, iii. 1.]” Tirmidhi, Abu Dawud, Ibn Majah and Darimi transmitted it.

The Messenger of Allah (saws) heard a man saying: O Allah, I ask Thee, I bear witness that there is no god but Thou, the One, He to Whom men repair, Who has not begotten, and has not been begotten, and to Whom no one is equal, and he said: You have supplicated Allah using His Greatest Name, when asked with this name He gives, and when supplicated by this name he answers.

Buraida told that God’s messenger heard a man saying, “O God I ask Thee by virtue of Thy being God than whom there is no god, the One, He to whom men repair, who has not begotten and has not been begotten, and to whom no one is equal,” and said, “He has supplicated God using His greatest name, when asked by which He gives and when supplicated by which He answers.” Tirmidhi and Abu Dawud transmitted it.

I was sitting with the Messenger of Allah (saws) and a man was offering prayer. He then made supplication: O Allah, I ask Thee by virtue of the fact that praise is due to Thee, there is no deity but Thou, Who showest favour and beneficence, the Originator of the Heavens and the earth, O Lord of Majesty and Splendour, O Living One, O Eternal One.

The Prophet (saws) then said: He has supplicated Allah using His Greatest Name, when supplicated by this name, He answers, and when asked by this name He gives.

Anas said that when he was sitting with the Prophet in the mosque a man who was praying said, “O God, I ask Thee by virtue of the fact that praise is due to Thee than whom there is no god, who showest favour and beneficence, the Originator of the heavens and the earth, O Lord of Majesty and Splendour, O Living One; O Eternal One, I ask of Thee.” The Prophet then said, “He has supplicated God using His greatest name, when supplicated by which He answers and when asked by which He gives.” Tirmidhi, Abu Dawud, Nasa’i and Ibn Majah transmitted it.

"The Prophet (saas) heard a man say: 'Allahumma! Inni as'aluka bi-annaka Antallahul-Ahadus-Samad, alladhi lam yalid wa lam yuwlud, wa lam yakun lahu kufuwan ahad (O Allah! I ask You by virtue of Your being Allah, the One, the Self-Sufficient Master, Who begets not nor was begotten, and there is none co-equal or comparable to Him).' The Messenger of Allah (saas) said: 'He has asked Allah by His Greatest Name, which if He is asked thereby He gives, and if He is called upon thereby He answers.'"

The Prophet (saws) entered the Masjid and there was a man who had performed Salat and was supplicating. He was saying in his supplication: “O Allah, none has the right to be worshipped but Allah, You are the One Who gives blessings, Originator of the heavens and the earth, Possessor of glory and generosity (Allāhumma lā ilāha illā ant, al-Mannān, Badī`us-samāwāti wal-arḍ, Dhal-Jalāli wal Ikrām).” So the Prophet (saws) said: “Do you know what he has supplicated Allah with? He has supplicated to Allah by His Greatest Name, the one which if He Is called upon by it, He responds, and when He is asked by it, He gives.”

"The Prophet (saas) heard a man say: 'Allahumma! Inni as'aluka bi-anna lakal-hamd. La ilaha illa Anta, wahdaka la sharika laka. Al-Mannan. Badi'us-samawati wal-ard. Dhul-jalali wal-ikram (O Allah! I ask You by virtue of the fact that all praise is due to You; none has the right to be worshiped but You alone, and You have no partner or associate, the Bestower, the Originator of the heavens and the earth, the Possessor of majesty and honor.' He (saas) said: 'He has asked Allah by His Greatest Name which, if He is asked thereby He gives and if He is called upon thereby He answers.'"

"I was sitting with the Messenger of Allah (SAW) and a man was standing and praying. When he bowed, prostrated and recited the tashahhud, he supplicated, and in his supplication he said: "Allahumma inni as'aluka bi-anna lakal-hamd, lailaha illa ant, al-mannanu badi'us-samawati wal-ard, ya dhal-jalali wal-ikram! Ya hayyu ya qayyum! Inni as'aluka. (O Allah, indeed I ask You since all praise is due to You, there is none worthy of worship but You, the Bestower, the Creator of the heavens and earth, O Possessor of majesty and honor, O Ever-living, O-Eternal, I ask of You.)' The Prophet (SAW) said: 'Do you know what he has supplicated with?' They said: "Allah (SWT) and His Messenger know best." He said: 'By the One in Whose Hand is my soul, he called upon Allah by His greatest Name, which, if He is called by it, He responds, and if He is asked by it, He gives.'"

“The Prophet (saws) heard a man supplicating, and he was saying: ‘O Allah, indeed, I ask you by my testifying that You are Allah, there is none worthy of worship except You, the One, As-Samad, the one who does not beget, nor was begotten, and there is none who is like Him (Allāhumma innī as’aluka bi annī ashhadu annaka antallāh, lā ilāha illā ant, al-aḥaduṣ-ṣamad, alladhī lam yalid wa lam yūlad, wa lam yakun lahu kufuwan aḥad).” He said: “So he said: ‘By the One in Whose Hand is my soul, he has asked Allah by His Greatest Name, the one which if He is called upon by it, He responds, and when He is asked by it, He gives.’”(One of the narrators) Zaid said: “So I mentioned it to Zuhair bin Mu`awiyah years after that, and he said: Abu Ishaq reported to me from Malik bin Mighwal.’” Zaid said: “Then I mentioned it to Sufyan, so he reported it to me from Malik.”