Al-Kāfi - Volume 7 > Making the People of the Book to take Oath
Hadith #2

2- عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ خَالِدٍ عَنْ عُثْمَانَ بْنِ عِيسَى عَنْ سَمَاعَةَ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) قَالَ سَأَلْتُهُ هَلْ يَصْلُحُ لأحَدٍ أَنْ يُحْلِفَ أَحَداً مِنَ الْيَهُودِ وَالنَّصَارَى وَالْمَجُوسِ بِ‏آلِهَتِهِمْ قَالَ لا يَصْلُحُ لأحَدٍ أَنْ يُحْلِفَ أَحَداً إِلا بِاللهِ عَزَّ وَجَلَّ.

2. A number of our people have narrated from Ahmad ibn Muhammad ibn Khalid from ‘Uthman ibn ‘Isa from Sama‘ah, who has narrated the following: “I once asked abu ‘ Abd Allah, ‘Alayhi al-Salam, if it is proper to make Jews, Christians and Zoroastrians take an oath by their deities. He (the Imam) said, ’It is not proper for anyone to take oath by anything other than Allah, most Majestic, most Glorious.’”