"Expel the family of Lot from your city; indeed, they are people who keep themselves pure"—meaning: they refrain from the deeds of the people of Lot.
﴿أَخْرِجُوا آلَ لُوطٍ مِنْ قَرْيَتِكُمْ إِنَّهُم أنَاس يتطهرون﴾ أَيْ: يَتَنَزَّهُونَ عَنْ أَعْمَالِ قَوْمِ لوط.