An Oath is not Valid except by Allah, One who does not Agree with Allah is not of Allah

قَالَ رَسُولُ اللَّهِ ص‌ لَا تَحْلِفُوا إِلَّا بِاللَّهِ وَ مَنْ حَلَفَ بِاللَّهِ فَلْيَصْدُقْ وَ مَنْ حُلِفَ لَهُ بِاللَّهِ فَلْيَرْضَ وَ مَنْ حُلِفَ لَهُ بِاللَّهِ فَلَمْ يَرْضَ فَلَيْسَ مِنَ اللَّهِ عَزَّ وَ جَلَّ.

“Ali ibn al-Husayn, ‘Alayhim al-Salam, has said that the Messenger of Allah, O Allah, grant compensation to Muhammad and his family worthy of their services to Your cause, has said, ‘Do not swear except by Allah and one who swears by Allah must be considered truthful. One must agree with an oath by Allah. If one does n

مَنْ حَلَفَ بِاللَّهِ فَلْيَصْدُقْ وَ مَنْ لَمْ يَصْدُقْ فَلَيْسَ مِنَ اللَّهِ وَ مَنْ حُلِفَ لَهُ بِاللَّهِ عَزَّ وَ جَلَّ فَلْيَرْضَ وَ مَنْ لَمْ يَرْضَ فَلَيْسَ مِنَ اللَّهِ عَزَّ وَ جَلَّ.

“Abu ‘Abd Allah, Alayhi al-Salam, has said, ‘If one swears by Allah it must be considered true, if one does not believe he is not of Allah. One must agree with an oath by Allah, if he does do so he is not of Allah, most Majestic, most Glorious.’”