Mishkat al-Masabih #1976
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
قَالَتْ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَصُومُ يَوْمَ السَّبْتِ وَيَوْمَ الْأَحَدِ أَكْثَرَ مَا يَصُومُ مِنَ الْأَيَّامِ وَيَقُولُ: «إِنَّهُمَا يَوْمَا عِيدٍ لِلْمُشْرِكِينَ فَأَنَا أُحِبُّ أَن أخالفهم» . رَوَاهُ أَحْمد
Umm Salama said that God's messenger used to fast on Saturdays and Sundays more than on other days, and he used to say, “They are days of festival for the polytheists, and I like to act contrary to them.”
Ahmad transmitted it.
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About Mishkat al-Masabih
This hadith is #1976 from Mishkat al-Masabih, in the Book of Fasting.