Mishkat al-Masabih #1981
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: كَانَ يَصُومُ يَوْمَ الِاثْنَيْنِ وَالْخَمِيسِ. فَقِيلَ: يَا رَسُولَ اللَّهِ إِنَّكَ تَصُومُ يَوْمَ الِاثْنَيْنِ وَالْخَمِيسِ. فَقَالَ:
" إِنَّ يَوْمَ الِاثْنَيْنِ وَالْخَمِيسِ يَغْفِرُ اللَّهُ فِيهِمَا لِكُلِّ مُسْلِمٍ إِلَّا ذَا هَاجِرَيْنِ يَقُولُ: دَعْهُمَا حَتَّى يصطلحا ". رَوَاهُ أَحْمد وَابْن مَاجَه
He said that the Prophet used to fast on Mondays and Thursdays, and when someone remarked on this to him he said, “On Monday and Thursday God forgives every Muslim except two who are at variance, for He says they must be left till they make peace with one another.”
Ahmad and Ibn Majah transmitted it.
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About Mishkat al-Masabih
This hadith is #1981 from Mishkat al-Masabih, in the Book of Fasting.