Al-Kāfi
Hadith 175116ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ مُحَمَّدِ بْنِ عِيسَى عَنْ يُونُسَ قَالَ حَدَّثَنِي إِسْمَاعِيلُ بْنُ سَعْدٍ الأحْوَصُ قَالَ قُلْتُ لِلرِّضَا (عَلَيْهِ الْسَّلام) كَمِ الصَّلاَةُ مِنْ رَكْعَةٍ فَقَالَ إِحْدَى وَخَمْسُونَ رَكْعَةً. مُحَمَّدُ بْنُ أَحْمَدَ بْنِ يَحْيَى عَنْ مُحَمَّدِ بْنِ عِيسَى مِثْلَهُ.
16. Ali ibn Ibrahim has narrated from Muhammad ibn ‘Isa from Yunus who has said that narrated to him ’Isma‘il ibn Sa‘d al-Ahwas who has said the following: “I asked al-Rida (a.s.), ‘Of how many Rak‘at does Salah (prayer) consist?’ He replied, ‘There are fifty-one Rak‘at (every day).”’ Muhammad ibn Ahmad ibn Yahya has narrated from Muhammad ibn ‘Isa a similar Hadith.