" لاَ تَحْلِفُوا بِآبَائِكُمْ وَلاَ بِأُمَّهَاتِكُمْ وَلاَ بِالأَنْدَادِ وَلاَ تَحْلِفُوا إِلاَّ بِاللَّهِ وَلاَ تَحْلِفُوا إِلاَّ وَأَنْتُمْ صَادِقُونَ "
It was narrated that Abu Hurairah said: "The Messenger of Allah said: 'Do not swear by your fathers, nor by your mothers nor by the idols. Swear only by Allah, and do not swear unless you are sincere.'"