1 Corinthians 16:11

let no man therefore despise him [1 Timothy 4:12]. But set him forward on his journey in peace, that he may come unto me: for I expect him with the brethren. [Timothy, as we have seen, went the long route by way of Macedonia, no doubt visiting the churches as he journeyed. Soon after his departure the messengers from Corinth arrived, bringing the letter from that church, and Paul sends this answer to it by Titus. Now, Titus was evidently despatched by the short route across the sea, with instructions to return by way of Macedonia. Therefore Paul uses "if," for he supposes that Titus may reach Corinth, discharge his errand, start through Macedonia, and there intercept Timothy so as to prevent his ever reaching Corinth. And this very thing seems to have happened, for Titus and Timothy, returning, evidently met Paul at Philippi, where he wrote his second Corinthian letter (2 Corinthians 1:1); yet only Titus is spoken of as having brought any report of the condition of affairs at Corinth (2 Corinthians 7:6-7). The Corinthians, therefore, had no chance to show their love for Paul by their welcome of Timothy. Paul's words with regard to him remind us that he was at that time a young man and liable to be intimidated by the factious, arrogant spirit of the Corinthians. Timothy seems to have been of a diffident and sensitive nature (1 Timothy 5:21-23; 2 Timothy 1:6-8). Paul warns them that any unkindness shown to this young man will soon be reported him, for he expects Timothy to return with Titus, Erastus and those with them-- Acts 19:22; 2 Corinthians 12:17-18; 2 Corinthians 8:18; 2 Corinthians 8:23]