How many (kam is predicative and is the direct object [of the main verb, ahlaknāhā, ‘We have destroyed’]) a city, meaning its inhabitants, have We destroyed, have We willed its destruction! So Our might, Our chastisement, came upon it at night or while they slept at noon (qā’ilūn: al-qaylūla is a rest taken halfway during the day, even if it does not involve sleep), in other words, sometimes it came upon it at night, and sometimes it came during the day.