Hadithcore
Riyad as-Salihin, 1576

Jundub bin 'Abdullah (May Allah be pleased with him) reported:

The Messenger of Allah (ﷺ) said, "Once someone said: 'By Allah! Allah will not forgive such and such (a person).' Thereupon Allah, the Exalted and the Glorious, said: 'Who is he who takes an oath in My Name that I will not grant pardon to so-and-so? I have granted pardon to so-and-so and rendered your good deeds fruitless."' <b>[Muslim]</b>.

وعن جُندب بن عبد الله رضي الله عنه قال‏:‏ قال رسول الله صلى الله عليه وسلم ‏:‏ ‏

‏قال رجل‏:‏ والله لا يغفر الله لفلان، فقال الله عز وجل‏:‏ من ذا الذي يتألى علي أن لا أغفر لفلان‏!‏ فإني قد غفرت له، وأحبطت عملك‏

‏ ‏(‏‏(‏رواه مسلم‏)‏‏)‏‏.‏

References1 variant
In-Book Reference
Book 17, Hadith 66
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) The mercy of Allah and His forgiveness of His slave’s sins is massive.<br> 2) One may say a word without giving it much thought but it leads him to ruin in the Hereafter, so one should contemplate his words before uttering them.
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