St. Matthew (Matthew 19:28) here introduces the great promise, to be fulfilled in the regeneration, that is, at the second coming of Christ—at the second birth of the world to a new and glorious state.
It may be that St. Matthew was guided to record it, inasmuch as his Gospel was written for Jews. Its omission by St. Mark and St. Luke may be explained by the fact that they were writing, the one to Romans, and the other to Gentiles generally.
Omitting further notice here of this great promise recorded only by St. Matthew, St. Mark's words seem general, common to all faithful Christians. This leaving, of house, or brethren, or sisters, etc.
, might be rendered necessary from various causes. But they are all covered by that one expression, for my sake, and for the gospel's.