Commentaries:
Robertson's Word Pictures (NT)
Hath been set at liberty (apolelumenon). Perfect passive participle of apoluw, to set free, in indirect discourse after ginwskete. Possibly from prison if he came to Rome at Paul's request (II Timothy 4:11, II Timothy 4:21).
Shortly (taxeion). Same comparative as in verse Hebrews 13:19, "sooner" than I expect (?).
Other Robertson's Word Pictures (NT) entries containing Hebrews 13:23:
John 13:27
Hebrews 6:3
Hebrews 13:19
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