King James Version
For as the lightning, that lighteneth out of the one part under heaven, shineth unto the other part under heaven; so shall also the Son of man be in his day.English Standard Version
For as the lightning flashes and lights up the sky from one side to the other, so will the Son of Man be in his day.New International Version
For the Son of Man in his day will be like the lightning, which flashes and lights up the sky from one end to the other.