Al-Kāfi - Volume 7 > The Intention for an Oath
Hadith #1

1- عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ هَارُونَ بْنِ مُسْلِمٍ عَنْ مَسْعَدَةَ بْنِ صَدَقَةَ قَالَ سَمِعْتُ أَبَا عَبْدِ اللهِ (عَلَيْهِ السَّلام) يَقُولُ وَسُئِلَ عَمَّا يَجُوزُ وَعَمَّا لا يَجُوزُ مِنَ النِّيَّةِ عَلَى الإضْمَارِ فِي الْيَمِينِ فَقَالَ قَدْ يَجُوزُ فِي مَوْضِعٍ وَلا يَجُوزُ فِي آخَرَ فَأَمَّا مَإ؛ششّّيغ يَجُوزُ فَإِذَا كَانَ مَظْلُوماً فَمَا حَلَفَ بِهِ وَنَوَى الْيَمِينَ فَعَلَى نِيَّتِهِ وَأَمَّا إِذَا كَانَ ظَالِماً فَالْيَمِينُ عَلَى نِيَّةِ الْمَظْلُومِ.

1. Ali ibn Ibrahim has narrated from Harun ibn Muslim from Mas’adah ibn Sadaqah who has narrated the following: “I once heard abu ‘ Abd Allah, ‘Alayhi al-Salam, when he (the Imam) was asked about what is lawful and what is not lawful about intention and what is in one’s mind, saying, ‘In certain times it is lawful and in certain times it is not lawful. The lawful case is when one is oppressed in which case his oath is based on his intention. If one coerces then it is on the basis of the intention of the oppressed.’”