[Machine] Ibn Abbas sent to Umm Salama and Aisha inquiring about the days that the Messenger of Allah ﷺ used to prefer fasting. They replied, "The Messenger of Allah ﷺ used to fast most frequently on Saturdays and Sundays, saying, 'These are the days of celebration for the People of the Book, and we like to differ from them.'"
أَنَّ ابْنَ عَبَّاسٍ بَعَثَ إِلَى أُمِّ سَلَمَةَ وَإِلَى عَائِشَةَ يَسْأَلُهُمَا مَا كَانَ رَسُولُ اللهِ ﷺ يُحِبُّ أَنْ يَصُومَ مِنَ الْأَيَّامِ فَقَالَتَا مَا مَاتَ رَسُولُ اللهِ ﷺ حَتَّى كَانَ أَكْثَرُ صَوْمِهِ يَوْمَ السَّبْتِ وَالْأَحَدِ وَيَقُولُ «هُمَا عِيدَانِ لِأَهْلِ الْكِتَابِ فَنَحْنُ نُحِبُّ أَنْ نُخَالِفَهُمْ»