Surah 55. Ar-Rahman

34This refers to the Day of Resurrection. Bursting of the heavens implies loosening of the discipline of the heavens, scattering of the celestial bodies, upsetting of the system of the heavens. And the meaning of `reddening like red leather" is that during that great upheaval anyone who looks up towards the sky, will feel as though the entire heavens were on fire.

35That is, "Today you deem Resurrection impossible; you think Allah has no power to bring it about. But when it will have taken place and you see with your eyes all that you are being foretold, which of the powers of Allah will you then deny?