Al-Bukhārī said:
“Qutaybah ibn Saʿīd related to us; Yaʿqūb ibn ʿAbd al-Raḥmān related to us, from ʿAmr ibn Abī ʿAmr, from Saʿīd ibn Abī Saʿīd, from Abū Hurayrah, who said:
‘I heard the Messenger of Allah ﷺ say:
“Indeed, when Allah created mercy He made it one hundred portions. He kept with Himself ninety-nine portions and sent down to all of His creation a single portion. Were the unbeliever to know all that is with Allah of mercy, he would never despair of Paradise; and were the believer to know all that is with Allah of punishment, he would never feel secure from the Fire.”’”
Al-Bukhārī alone transmitted this wording. ⦗1⦘

Ibn Mājah then said:
“Abū Kurayb and Aḥmad ibn Sinān both narrated to us; Abū Muʿāwiyah narrated to us, from al-Aʿmash, from Abū Ṣāliḥ, from Abū Saʿīd, who said:
‘The Messenger of Allah ﷺ said:
“On the day Allah created the heavens and the earth He created one hundred mercies. He placed one mercy upon the earth—through it the mother shows compassion to her child, the animals show kindness to one another, and the birds likewise. He deferred ninety-nine mercies until the Day of Resurrection; when that Day comes, Allah will complete them with this mercy.”’”
Ibn Mājah transmitted it alone, and it meets the conditions of the two Ṣaḥīḥ collections. ⦗2⦘

Ibn Mājah also cited the report that both Ṣaḥīḥs record through various chains from Abū Hurayrah, from the Prophet ﷺ:
“Indeed, Allah wrote a book on the day He created the heavens and the earth: ‘My mercy prevails over My wrath.’”
In another narration: “has preceded My wrath.”
In yet another: “It is placed with Him upon the Throne,” and in yet another: “above the Throne.” ⦗3⦘ All of these narrations are sound.

Allah, Exalted is He, has said:
“Say, ‘To whom belongs whatever is in the heavens and the earth?’ Say, ‘To Allah. He has prescribed mercy for Himself.’” (al-Anʿām 12)
And He said: “Your Lord has prescribed mercy for Himself.” (al-Anʿām 54)
And He said: “My mercy encompasses all things, but I shall ordain it for those who are mindful, give the zakāt, and believe in Our revelations.” (al-Aʿrāf 156)
He also says: “Our Lord, You have encompassed all things in mercy and knowledge.” (Ghāfir 7)—this is the angels’ testimony about Allah, Glorified is He, that He has encompassed everything in mercy and knowledge.
And He says: “But if they belie you, then say: ‘Your Lord is the possessor of all-embracing mercy; yet His punishment will not be averted from the criminal people.’” (al-Anʿām 147)

Ibn Mājah then cited the ḥadīth of [Ibn Abī Laylā, from] Muʿādh ibn Jabal, from the Prophet ﷺ, in which he said to him:
“O Muʿādh, do you know what right Allah has over His servants?”
I replied, “Allah and His Messenger know best.”
He said, “That they worship Him and do not associate anything with Him.”
He then said, “Do you know what right the servants have over Allah if they do that? That He will not punish them.”
This report is established in Ṣaḥīḥ al-Bukhārī through the route of al-Aswad ibn Hilāl and Anas ibn Mālik, from Muʿādh. ⦗4⦘