Except for an hour of the day, they seek to approximate the time of their stay in the world. It is said that in the graves, due to the terror of what they see, they recognize one another, knowing some of them, as if they had not been separated except for a little while. This is at the time of their emergence from the graves, then the recognition among them ceases due to the severity of the matter upon them. If you say: How is the position of 'as if they had not stayed' and 'they recognize one another'? I say: As for the first, it is a state of 'them', meaning He gathers them appearing as those who have not stayed except for an hour. As for the second, it may relate to the circumstance, or it may be explanatory, due to His saying: 'as if they had not stayed except for an hour', because recognition does not remain with the length of time and turns into mutual ignorance. They have certainly lost regarding the intended saying, meaning they recognize one another saying that, or it is a testimony from Allah, glorified and exalted is He, about their loss. The meaning is that they have placed in their trade and their sale their faith for disbelief, and they were not guided in the trade, knowing it. This is an introduction that carries the meaning of astonishment, as if it were said: How great is their loss!