Mishkat al-MasabihChapter 7Hadith 1976
Full Sharh — Mishkat al-Masabih 1976
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
English Translation
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.
Source
Mishkat al-Masabih(مشكاة المصابيح)
Fasting
Hadith Number
1976