"Taste ye then - for ye forgot the Meeting(3646) of this Day of yours, and We too will forget you - taste ye the Penalty of Eternity for your (evil) deeds!"
3646 Cf. n. 1029 to 7:51. "Forget" here is in the sense of "to ignore deliberately, to reject with scorn". In the sense of mistake or defect of knowledge it is inapplicable to the All-Perfect Being, for we are expressly told, "My Lord never errs, nor forgets": 20:52 .