1 Timothy 1:3

As I besought thee to abide still at Ephesus. Paul, it is presumed, seeing on the occasion of his last visit the need of a trusty evangelist at Ephesus to counteract the errors which were arising, had left Timothy behind. He was not left there as a bishop, as has been sometimes claimed, for we find that a part of his business was to appoint bishops; but as the representative of the apostle, an evangelist. The office of Titus in Crete was similar.

That they teach no other doctrine. Than the gospel which they had been taught. Some of the errors which he was to correct are stated in 1Ti 1:4.
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