Al-Kāfi
Hadith 10095ـ حَمَّادٌ عَنْ حَرِيزٍ عَنْ زُرَارَةَ قَالَ سَأَلْتُ أَبَا جَعْفَرٍ (عَلَيْهِ الْسَّلام) عَنِ الْفَرْضِ فِي الصَّلاَةِ فَقَالَ الْوَقْتُ وَالطَّهُورُ وَالْقِبْلَةُ وَالتَّوَجُّهُ وَالرُّكُوعُ وَالسُّجُودُ وَالدُّعَاءُ قُلْتُ مَا سِوَى ذَلِكَ قَالَ سُنَّةٌ فِي فَرِيضَةٍ.
5. Hammad has narrated from Hariz from Zurarah from who has said the following: “I once asked abu Ja‘far (a.s.), about what is obligatory in Salah (prayer). He (the Imam) said, ‘Time, al-Tahur (cleansing), facing al-Qiblah (al-Ka‘bah), paying attention, al-Ruku‘, al-Sujud and praying. The rest are optional in an obligatory duty.’”