they said swear to one another in the name of allah that we shall make a sudden night swoop on salih and his family and will then tell their heirs that we did not witness the destruction of his family. we are indeed truthful.
قالوا تقاسموا بالله لنبيتنه وأهله ثم لنقولن لوليه ما شهدنا مهلك أهله وإنا لصادقون