Translation:

56. "Lest the soul should (then) say: Ah! woe is me! In that I neglected (my duty) towards Allah and was but among those who mocked!'

Notes (Tafseer)

4327. Many kinds of sighs and regrets will then assail us. In the first place, we shall see our shortcomings: we were negligent when we should have been serious: we mocked when we should have tried to learn and understand. But it will be too late then to retrieve our position.