Al Husayn Bin Ahmad narrated to us, from his father, from Ahmad Bin Muhammad Bin Isa, from Al Husayn Bin Saeed, from Al Nasr Bin Suweyd Bin Hisham Bin Al Hakam, from Al Ahowl, from Ibn Sinan, from the one who mentioned it, Abu Abdullah -asws has said: ‘Rasool-Allah -saww was asked about Fasting the two Thursdays, between these two, a Wednesday, so he -saww said: ‘As for the Thursday, so it is a day in which the deeds are presented, and as for the Wednesdays, so it is a day in which the Fire was Created, and as for the Fast, so it is a shield from the Fire’.
A number of our companions, from Sahl Bin Ziyad, from Ahmad Bin Muhammad Bin Abu Nasr who said, ‘I asked Abu Al-Hassan -asws about the Fasts during the month, how are these (to be done)?’ He -asws said: ‘Three during the month, in every ten days. Allah -azwj Blessed and Exalted is Saying: One who comes with the good deed, then for him would be ten the likes of it [6:160] – three days during the month is Fasting for the whole time’.
[3] Optional Fasting is to make one habitual of good deeds: عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنِ الْحَسَنِ بْنِ مَحْبُوبٍ عَنْ عَبْدِ اللَّهِ بْنِ سِنَانٍ قَالَ سَأَلْتُ أَبَا عَبْدِ اللَّهِ ( عليه السلام ) عَنِ الرَّجُلِ يَصُومُ صَوْماً قَدْ وَقَّتَهُ عَلَى نَفْسِهِ أَوْ يَصُومُ مِنْ أَشْهُرِ الْحُرُمِ فَيَمُرُّ بِهِ الشَّهْرُ وَ الشَّهْرَانِ لَا يَقْضِيهِ فَقَالَ لَا يَصُومُ فِي السَّفَرِ وَ لَا يَقْضِي شَيْئاً مِنْ صَوْمِ التَّطَوُّعِ إِلَّا الثَّلَاثَةَ الْأَيَّامِ الَّتِي كَانَ يَصُومُهَا مِنْ كُلِّ شَهْرٍ وَ لَا يَجْعَلُهَا بِمَنْزِلَةِ الْوَاجِبِ إِلَّا أَنِّي أُحِبُّ لَكَ أَنْ تَدُومَ عَلَى الْعَمَلِ الصَّالِحِ A number of our companions, from Sahl Bin Ziyad, from Al Hassan Bin Mahboub, from Abdullah Bin Sinan who said, ‘I asked Abu Abdullah -asws about the man who had committed it (Fasting) upon himself, or he was Fasting from Sacred Months.
So the month, and the two month pass by him, not fulfilling it.