وَأَقْسَمُوا بِاللَّهِ جَهْدَ أَيْمَانِهِمْ لَئِنْ أَمَرْتَهُمْ لَيَخْرُجُنَّ ۖ قُلْ لَا تُقْسِمُوا ۖ طَاعَةٌ مَعْرُوفَةٌ ۚ إِنَّ اللَّهَ خَبِيرٌ بِمَا تَعْمَلُونَ 53
And they swear by Allah their strongest oaths that if you ordered them, they would go forth [in Allah 's cause]. Say, "Do not swear. [Such] obedience is known. Indeed, Allah is Acquainted with that which you do."