Charles Ellicott Commentary Hebrews 13:23

"Know ye that our brother Timothy hath been set at liberty; with whom, if he come shortly, I will see you." — Hebrews 13:23 (ASV)

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