Verse 3
Yet have I sent the brethren - Titus and his companions, mentioned in the preceding chapter.
That, as I said, ye may be ready - And he wished them to be ready, that they might preserve the good character he had given them: this was for their honor; and if they did not take care to do so, he might be reputed a liar; and thus both they and himself be ashamed before the Macedonians, should any of them at this time accompany him to Corinth.