Translation:

1. O mankind! fear your Lord! For the convulsion of the Hour (of Judgment) will be a thing terrible!

Notes (Tafseer)

2770. The serious issues involved are indicated by showing how terrible the consequences will be for those who disobey Allah's Will. The terror will only be for those who rebel and disobey: the righteous will not suffer from it, but on the contrary will be greeted by angels with joy (xxi. 103).