On the authority of Abu Hurayrah, from the Messenger of Allah, peace and blessings be upon him, who said: "When Allah created creation, He wrote with His Hand upon Himself: 'Indeed, My mercy prevails over My wrath.'" (1)

This is a good and authentic hadith. (2)

3856 - Muhammad ibn Abi Thalj, a man from the people of Baghdad, Abu Abdullah, a companion of Ahmad ibn Hanbal, narrated to us, saying: Yunus ibn Muhammad narrated to us, saying: Sa'id ibn Zarbi narrated to us, from 'Asim al-Ahwal and Thabit, from Anas, who said: The Prophet, peace and blessings be upon him, entered the mosque while a man had prayed and was supplicating, saying in his supplication: "O Allah, there is no god but You, the Most Benevolent, Originator of the heavens and the earth, Possessor of Majesty and Honor." The Prophet, peace and blessings be upon him, said: "Do you know by what he supplicated Allah? He supplicated Allah by His Greatest Name, which when supplicated by, He answers, and when--------------------------------------------
(1) The hadith is authentic apart from his saying "with His Hand," for this is an anomalous addition transmitted from Abu Hurayrah only by 'Ajlan, who was contradicted by those more reliable than him. It was also recorded by Ibn Abi Shaybah 13/180, Ibn Majah (189) and (4295), Ibn Khuzaymah in "Al-Tawhid" 1/19 and 134, and Ibn Hibban (6145) via multiple chains from Muhammad ibn 'Ajlan, with this chain of transmission. It was recorded without this addition by Ahmad (7500), al-Bukhari (3194), (7422), and (7453), Muslim (2751) (14), al-Nasa'i in "Al-Kubra" (7703) and (7709), and al-Bayhaqi in "Al-Asma' wa al-Sifat" pp. 395-396 via multiple chains from Abu al-Zinad, from al-A'raj, from Abu Hurayrah.

(2) In the printed edition it appears as: "good, authentic, and strange," but what is confirmed is from all our manuscript sources, and from the commentary of al-Mubarakfuri, and "Tuhfat al-Ashraf" 10/250.