40 Hadith Qudsi 31
الأربعون القدسية#31Not gradedOn the authority of Jundub (may Allah be pleased with him), who said that the Messenger of Allah (ﷺ) related: A man said: By Allah, Allah will not forgive So-and-so. At this Allah the Almighty said: Who is he who swears by Me that I will not forgive So-and-so? Verily I have forgiven So-and-so and have nullified your [own good] deeds (1) (or as he said [it]). (1) A similar Hadith, which is given by Abu Dawud, indicates that the person referred to was a goldly man whose previous good deeds were brought to nought through presuming to declare that Allah would not forgive someone's bad deeds. It was related by Muslim
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Our source carries no per-scholar grade for this narration. Please verify on Sunnah.com or with a qualified scholar before relying on it.
In-book reference: 1:31