Units/Cycles in Salat
– فَلَاحُ السَّائِلِ، وَ مِنَ الصَّلَوَاتِ بَيْنَ الْعِشَاءَيْنِ مَا رَوَاهُ مُحَمَّدُ بْنُ أَحْمَدَ الْقُمِّيُّ عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ يَحْيَى الْعَطَّارِ عَنْ سَعْدِ بْنِ عَبْدِ اللَّهِ عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ عِيسَى الْأَشْعَرِيِّ عَنِ الْحُسَيْنِ بْنِ سَعِيدٍ رَفَعَهُ إِلَى أَبِي عَبْدِ اللَّهِ ع قَالَ: مَنْ صَلَّى بَعْدَ الْمَغْرِبِ أَرْبَعَ رَكَعَاتٍ يَقْرَأُ فِي كُلِّ رَكْعَةٍ خَمْسَ عَشْرَةَ مَرَّةً قُلْ هُوَ اللَّهُ أَحَدٌ انْفَتَلَ مِنْ صَلَاتِهِ وَ لَيْسَ بَيْنَهُ وَ بَيْنَ اللَّهِ تَعَالَى ذَنْبٌ إِلَّا وَ قَدْ غُفِرَ لَهُ
(The book) ‘Falah Al Saail’ – And from the Salats between the two Isha’s is what is reported by Muhammad Bin Ahmad Al Qummi, from Ahmad Bin Muhammad Bin Yahya Al Attar, from Sa’ad Bin Abdullah, from Ahmad Bin Muhammad Bin Isa Al Ashari, from Al-Husayn Bin Saeed,
Raising it to Abu Abdullah-asws having said: ‘One who prays (optional) Salat of four Cycles after Al-Maghrib, reciting in every Cycle (Surah) Al Tawheed fifteen times, will finish from his Salat and there wouldn’t be any sin between him and Allah-azwj the Exalted except and it would have been Forgiven for him’.[1]
[1] Bihar Al-Anwaar V 84 – The Book Salat – Ch 73 H 18 a