Mishkat al-Masabih #1955
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 أَيُّوبَ الْأَنْصَارِيِّ أَنَّهُ حَدَّثَهُ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «مَنْ صَامَ رَمَضَانَ ثُمَّ أَتْبَعَهُ سِتًّا مِنْ شَوَّال كَانَ كصيام الدَّهْر» . رَوَاهُ مُسلم
Abu Ayyub al-Ansari told that God’s messenger said, “If anyone fasts during Ramadan, then follows it with six days in Shawwal, it will be like a perpetual fast.”
Muslim transmitted it.
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About Mishkat al-Masabih
This hadith is #1955 from Mishkat al-Masabih, in the Book of Fasting.