Al-Kāfi - Volume 7 > It is not Permissible to take an Oath by anything other than by Allah, most Majestic, most Glorious
Hadith #3

3- عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنِ ابْنِ أَبِي نَصْرٍ عَنْ عَبْدِ الْكَرِيمِ عَنْ سَمَاعَةَ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) قَالَ لا أَرَى لِلرَّجُلِ أَنْ يَحْلِفَ إِلا بِاللهِ وَقَالَ قَوْلُ الرَّجُلِ حِينَ يَقُولُ لابَ لِشَانِئِكَ فَإِنَّمَا هُوَ مِنْ قَوْلِ الْجَاهِلِيَّةِ وَلَوْ حَلَفَ النَّاسُ بِهَذَا وَشِبْهِهِ تُرِكَ أَنْ يُحْلَفَ بِاللهِ.

3. A number of our people have narrated from Sahl ibn Ziyad from ibn abu from ‘Abd al-Karim from Sama‘ah who has narrated the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, has said, ‘I say that a man must take an oath and swear by Allah only. People’s saying, la’ bal shane ’uka (no, but may your adversary be it) is of the expressions of the people of ignorance.’”