The news of my fasting was mentioned to the Prophet ﷺ . So he entered upon me and I put for him a leather cushion stuffed with palm-fibres. The Prophet ﷺ sat on the floor and the cushion was between me and him. He said to me, "Isn't it sufficient for you (that you fast) three days a month?" I said, "O Messenger of Allah ﷺ! (I can fast more than this)." He said, "You may fast) five days a month." I said, "O Messenger of Allah ﷺ! (I can fast more than this)." He said, "(You may fast) seven days." I said, "O Allah's Apostle!" He said, "Nine." I said, "O Messenger of Allah ﷺ!" He said, "Eleven." I said, "O Messenger of Allah ﷺ!" He said, "No fasting is superior to the fasting of (the Prophet ﷺ David) which was one half of a year, and he used, to fast on alternate days. (See Hadith No. 300, Vol 3)
فَحَدَّثَنَا أَنَّ النَّبِيَّ ﷺ ذُكِرَ لَهُ صَوْمِي فَدَخَلَ عَلَىَّ فَأَلْقَيْتُ لَهُ وِسَادَةً مِنْ أَدَمٍ حَشْوُهَا لِيفٌ فَجَلَسَ عَلَى الأَرْضِ وَصَارَتِ الْوِسَادَةُ بَيْنِي وَبَيْنَهُ فَقَالَ لِي أَمَا يَكْفِيكَ مِنْ كُلِّ شَهْرٍ ثَلاَثَةُ أَيَّامٍ قُلْتُ يَا رَسُولَ اللَّهِ قَالَ خَمْسًا قُلْتُ يَا رَسُولَ اللَّهِ قَالَ سَبْعًا قُلْتُ يَا رَسُولَ اللَّهِ قَالَ تِسْعًا قُلْتُ يَا رَسُولَ اللَّهِ قَالَ إِحْدَى عَشْرَةَ قُلْتُ يَا رَسُولَ اللَّهِ قَالَ لاَ صَوْمَ فَوْقَ صَوْمِ دَاوُدَ شَطْرَ الدَّهْرِ صِيَامُ يَوْمٍ وَإِفْطَارُ يَوْمٍ