The Chapter on Obligatory Prayers
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 30
وَ رُوِيَ عَنْ عَائِذٍ اَلْأَحْمَسِيِّ أَنَّهُ قَالَ: دَخَلْتُ عَلَى أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ وَ أَنَا أُرِيدُ أَنْ أَسْأَلَهُ عَنِ اَلصَّلاَةِ فَبَدَأَنِي فَقَالَ «إِذَا لَقِيتَ اَللَّهَ عَزَّ وَ جَلَّ بِالصَّلَوَاتِ اَلْخَمْسِ لَمْ يَسْأَلْكَ عَمَّا سِوَاهُنَّ.
It is narrated from 'Aidh al-Amasi that He said: "I entered upon Imam Jafar ibn Muhammad Al-Sadiq عليه السلام with the intention of asking him about prayer. Imam عليه السلام began speaking before I could ask and said: 'If you meet Allah سبحانه وتعالى, the Mighty and Majestic, with the five daily prayers, He will not ask you about anything else.'".
- Ṣaḥīḥ al-Faqīh, p. 33