Mishkat al-Masabih #1949
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن ابْنِ عَبَّاسٍ قَالَ: حِينَ صَامَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَوْمَ عَاشُورَاءَ وَأَمَرَ بِصِيَامِهِ قَالُوا: يَا رَسُولَ اللَّهِ إِنَّهُ يَوْمٌ يُعَظِّمُهُ الْيَهُودُ وَالنَّصَارَى. فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَئِنْ بَقِيتُ إِلَى قَابِلٍ لأصومن التَّاسِع» . رَوَاهُ مُسلم
He said that when God’s messenger fasted on the day of ‘Ashura’ and commanded that it should be observed as a fast, he was told it was a day held in honour by Jews and Christians, and said, “If I am spared till next year I shall fast on the ninth.”
Muslim transmitted it.
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About Mishkat al-Masabih
This hadith is #1949 from Mishkat al-Masabih, in the Book of Fasting.