Mishkat al-Masabih 15 Oaths and Vows كتاب الإيمان والنذور 13

عَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَا تَحْلِفُوا بِآبَائِكُمْ وَلَا بِأُمَّهَاتِكُمْ وَلَا بِالْأَنْدَادِ وَلَا تَحْلِفُوا بِاللَّهِ إِلَّا وَأَنْتُمْ صَادِقُونَ» . رَوَاهُ أَبُو دَاوُدَ وَالنَّسَائِيُّ

Abu Huraira reported God’s Messenger as saying, “Do not swear by your fathers, or by your mothers, or by rivals (Cf. Al-Qur’an 2:22 etc. The reference is to idols or false gods) to God; and swear by God only when you are speaking the truth.” Abu Dawud and Nasa’i transmitted it.