Al-Kāfi - Volume 7 > It is not Permissible to take an Oath by anything other than by Allah, most Majestic, most Glorious
Hadith #2

2- عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ حَمَّادٍ عَنِ الْحَلَبِيِّ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) قَالَ لا أَرَى أَنْ يَحْلِفَ الرَّجُلُ إِلا بِاللهِ فَأَمَّا قَوْلُ الرَّجُلِ لابَ لِشَانِئِكَ فَإِنَّهُ مِنْ قَوْلِ أَهْلِ الْجَاهِلِيَّةِ وَلَوْ حَلَفَ الرَّجُلُ بِهَذَا وَأَشْبَاهِهِ لَتُرِكَ الْحَلْفُ بِاللهِ فَأَمَّا قَوْلُ الرَّجُلِ يَا هَيَاهْ وَيَا هَنَاهْ فَإِنَّمَا ذَلِكَ لِطَلَبِ الاسْمِ وَلا أَرَى بِهِ بَأْساً وَأَمَّا قَوْلُهُ لَعَمْرُ اللهِ وَقَوْلُهُ لا هَاهُ فَإِنَّمَا ذَلِكَ بِاللهِ عَزَّ وَجَلَّ.

2. Ali ibn Ibrahim has narrated from his father from ibn abu ‘Umayr from Hammad from al-Halabiy 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. If one takes an oath by such expressions and so on, he has ignored taking an oath by Allah. One’s expression, Ya Hayahu and ya Hanahu is only a pausing and punctuating effort to better articulate one’s idea. However, one’s saying la’umr Allah or Lahahu is swearing by Allah, most Majestic, most Glorious.’”