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.

For as the lightening that lighteneth from under heaven, shineth unto the parts that are under heaven, so shall the Son of man be in his day.

For as the lightning shines which lightens from one end under heaven to the other end under heaven, thus shall the Son of man be in his day.

for as the lightning that is lightening out of the one part under heaven, to the other part under heaven doth shine, so shall be also the Son of Man in his day;

For as the lightning, that lightens out of the one part under heaven, shines to the other part under heaven; so shall also the Son of man be in his day.

For just as the lightning, when it flashes, shines from one part of the horizon to the opposite part, so will the Son of Man be on His day.

For as in a thunderstorm the bright light is seen from one end of the sky to the other, so will the Son of man be when his time comes.

For just as lightning flashes from under heaven and shines to whatever is under heaven, so also will the Son of man be in his day.

For, just as lightning will lighten and flare from one side of the heavens to the other, so will it be with the Son of Man.

As the lightning, that lighteneth - See this particularly explained, Matthew 24:27, Matthew 24:28 (note).

For as the lightning that lighteneth out of the one part under heaven,.... The Syriac version reads, "out of heaven", and the Arabic version, "in heaven"; which is the seat of lightning, and from whence it arises:
and shineth unto the other part under heaven; enlightens the earth, which is under the heaven: though the sense of the words, as they lie in the original text, seems to be, that as the lightning lightens at one end of the heavens, and shines to the other; which is done at once, in a moment, in a twinkling of the eye, and to which agrees the Ethiopic version;
so shall also the son of man be in his day: which is not to be understood of the swift progress of the Gospel, after his resurrection and ascension, and the pouring forth of his Spirit; but of his sudden coming, first to take vengeance on the Jewish nation for their rejection of him, and then at the last day, to judge both quick and dead. By his day, is meant his kingdom and glory, or his appearance with power, and great glory: Thus we read (f) for Solomon, "in his hour", that is, in his glory, in the time of his kingdom, when he was in his greatest magnificence.
(f) Misna Bava Metzia, c. 7. sect. 1. & Jarchi & Bartenora in ib. Vid. Shirhashirim Rabba, fol. 15. 4. & 16. 1.

as lightning . . . so . . . the Son of man--that is it will be as manifest. The Lord speaks here of His coming and manifestation in a prophetically indefinite manner, and in these preparatory words blends into one the distinctive epochs [STIER]. When the whole polity of the Jews, civil and ecclesiastical alike, was broken up at once, and its continuance rendered impossible by the destruction of Jerusalem, it became as manifest to all as the lightning of heaven that the kingdom of God had ceased to exist in its old, and had entered on a new and perfectly different form. So it may be again, ere its final and greatest change at the personal coming of Christ, and of which the words in their highest sense are alone true.

So shall also the Son of man be - So swift, so wide, shall his appearing be: In his day - The last day.