Chapter on Oaths, Vows, and Expiations
Man Lā Yaḥḍuruh al-Faqīh|Volume 3|Book 2|Chapter 38
وَ قَالَ عَلَيْهِ اَلسَّلاَمُ: فِي رَجُلٍ حَلَفَ تَقِيَّةً قَالَ "إِنْ خَشِيتَ عَلَى دَمِكَ وَ مَالِكَ فَاحْلِفْ تَرُدُّهُ عَنْكَ بِيَمِينِكَ فَإِنْ رَأَيْتَ أَنَّ يَمِينَكَ لاَ تَرُدُّ عَنْكَ شَيْئاً فَلاَ تَحْلِفْ لَهُمْ".
Imam عليه السلام was asked about a man who swore an oath out of taqiyyah (dissimulation). Imam عليه السلام said: "If you fear for your life or property, then swear an oath to protect yourself with it. However, if you see that your oath will not protect you in any way, then do not swear to them."
- Ṣaḥīḥ al-Faqīh