Chapter on Fasting on the Day of Doubt
Man Lā Yaḥḍuruh al-Faqīh|Volume 2|Book 2|Chapter 16
وَ قَالَ اَلصَّادِقُ عَلَيْهِ اَلسَّلاَمُ: «لَوْ قُلْتُ إِنَّ تَارِكَ اَلتَّقِيَّةِ كَتَارِكِ اَلصَّلاَةِ لَكُنْتُ صَادِقاً».
Imam Jafar ibn Muhammad Al-Sadiq عليه السلام said: "If I were to say that abandoning taqiyyah (dissimulation) is like abandoning prayer, I would be truthful."
- Ṣaḥīḥ al-Faqīh