Hebrews 13:23 - Ellicott's Commentary On The Whole Bible

It is clear that the Hebrew Christians knew of the imprisonment of Timothy, but had not heard the news of his release. In 2 Corinthians 1:1; Colossians 1:1; Philemon 1:1, Timothy is spoken of as “the brother;” in 1 Thessalonians 3:2, and here, as “our brother” (for the word “our” printed in italics in the Authorised version, belongs to the true text). With him, the writer adds, “if he come shortly [sooner than the date at which he himself must depart], I will see you.”