Surah An-Nur, Verse 53

۞ وَأَقۡسَمُواْ بِٱللَّهِ جَهۡدَ أَيۡمَٰنِهِمۡ لَئِنۡ أَمَرۡتَهُمۡ لَيَخۡرُجُنَّۖ قُل لَّا تُقۡسِمُواْۖ طَاعَةٞ مَّعۡرُوفَةٌۚ إِنَّ ٱللَّهَ خَبِيرُۢ بِمَا تَعۡمَلُونَ٥٣

wa-aqsamū bil-lahi jahda aymānihim la-in amartahum layakhrujunna qul lā tuq'simū ṭāʿatun maʿrūfatun inna l-laha khabīrun bimā taʿmalūna

And they swear by Allāh their strongest oaths that if you ordered them, they would go forth [in Allāh's cause]. Say, "Do not swear. [Such] obedience is known. Indeed, Allāh is [fully] Aware of that which you do."