"And Our command" (l. 347), meaning the coming of the Hour, "is but one, like the twinkling of an eye." The interpretation of al-Hasan is: when the punishment of the disbelievers of the end of this nation arrives with the first blast of the Trumpet.
Muhammad said: The meaning is that when He wills their destruction, the speed of His power in bringing it about is as the speed of a twinkling eye. This is what al-Hasan intended. The meaning of "the twinkling of an eye" is that the eye gazes at the sky, which is a journey of five hundred years, and this is from His immense power.
His saying: "except one," the meaning is: except one command.