Chapter on Oaths, Vows, and Expiations
Man Lā Yaḥḍuruh al-Faqīh|Volume 3|Book 2|Chapter 38
وَ قَالَ عَلِيٌّ عَلَيْهِ اَلسَّلاَمُ: "اِحْلِفْ بِاللَّهِ كَاذِباً وَ أَنْجِ أَخَاكَ مِنَ اَلْقَتْلِ ".
And Imam Ali ibn Abi Talib عليه السلام said: "Swear by Allah سبحانه وتعالى falsely and save your brother from being killed."
- Ṣaḥīḥ al-Faqīh