And you would think them awake, while they were asleep. And We turned them to the right and to the left, while their dog stretched his forelegs at the entrance. If you had looked at them, you would have turned from them in flight and been filled by them with terror. 18 As such We revived them so that they might question one another. 'How long have you stayed here' asked one of them. 'We have been here a day, or part of it' they replied. They said: 'Your Lord knows best how long we have stayed here. Let one of you go to the city with this silver (coin) and let him search for one who has the purest food and bring provision from it. Let him be courteous, but let no one sense it is you. 19 If they should get knowledge of you they will stone you, or restore you to their creed, then you will not prosper ever. 20 And even so We made them stumble upon them, that they might know that God's promise is true, and that the Hour -- there is no doubt of it. When they were contending among themselves of their affair then they said, 'Build over them a building; their Lord knows of them very well.' Said those who prevailed over their affair, 'We will raise over them a place of worship.' 21 (Some) say they were three, the dog being the fourth among them; (others) say they were five, the dog being the sixth,- doubtfully guessing at the unknown; (yet others) say they were seven, the dog being the eighth. Say thou: "My Lord knoweth best their number; It is but few that know their (real case)." Enter not, therefore, into controversies concerning them, except on a matter that is clear, nor consult any of them about (the affair of) the Sleepers. 22