The Chapter on the Virtues of Prayer
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 31
وَقَالَ اَلصَّادِقُ عَلَيْهِ اَلسَّلاَمُ: «مَنْ قَبِلَ اَللَّهُ مِنْهُ صَلاَةً وَاحِدَةً لَمْ يُعَذِّبْهُ وَ مَنْ قَبِلَ اَللَّهُ لَهُ حَسَنَةً لَمْ يُعَذِّبْهُ.
Imam Jafar ibn Muhammad Al-Sadiq عليه السلام said: "Whoever has one prayer accepted by Allah سبحانه وتعالى will not be punished, and whoever has one good deed accepted by Allah سبحانه وتعالى will not be punished."
- Ṣaḥīḥ al-Faqīh