Al-Kāfi - Volume 7 > It is not Permissible to take an Oath by anything other than by Allah, most Majestic, most Glorious
Hadith #1

1- عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ حَمَّادٍ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ قَالَ قُلْتُ لأبِي جَعْفَرٍ (عَلَيْهِ السَّلام) قَوْلُ اللهِ عَزَّ وَجَلَّ وَاللَّيْلِ إِذا يَغْشى‏ وَالنَّجْمِ إِذا هَوى‏ وَمَا أَشْبَهَ ذَلِكَ فَقَالَ إِنَّ للهِ عَزَّ وَجَلَّ أَنْ يُقْسِمَ مِنْ خَلْقِهِ بِمَا شَاءَ وَلَيْسَ لِخَلْقِهِ أَنْ يُقْسِمُوا إِلا بِهِ.

1. Ali ibn Ibrahim has narrated from his father from ibn abu ‘Umayr from Hammad from Muhammad ibn Muslim who has narrated the following: “This is about the meaning of the words of Allah, most Majestic, most Glorious. . . I swear by the night when it becomes dark. . .’ (92:2) and ‘. . . I swear by the star when it descends down’ (52:2) and so on. Abu Ja’far, ‘Alayhi al-Salam, has said, ‘Allah, most Majestic, most Glorious, swears by anything of His creatures as He wants but His creatures can only swear and take oath by Allah.’”