What is the meaning of Colossians 4:10?

* The two F.O.G. Bibles & Commentary below are currently a work in progress.

My fellow prisoner Aristarchus sends you greetings, as does Mark the cousin of Barnabas. You have already received instructions about him: If he comes to you, welcome him.

Berean Standard Bible (BSB)

Aristarchus, my fellow prisoner, greets you, and Mark, the cousin of Barnabas (concerning whom you received commandments, “if he comes to you, receive him”),

World English Bible (WEB)

Aristarchus{G708} my{G3450} fellowprisoner{G4869} saluteth{G782}{(G5736)} you{G5209}, and{G2532} Marcus{G3138}, sister's son{G431} to Barnabas{G921},(touching{G4012} whom{G3739} ye received{G2983}{(G5627)} commandments{G1785}: if{G1437} he come{G2064}{(G5632)} unto{G4314} you{G5209}, receive{G1209}{(G5663)} him{G846};)

Strong's King James

(10) Aristarchus (Best Ruler) my fellow prisoner sends you his greetings and Bar-Nabba's (Son of Encouragement) cousin Mark (Polite; Hammer) about whom you received commandments. If he comes to you, welcome him.

The F.O.G*

[10] Aristarchus, my fellow prisoner, sends his greetings, as does Mark, Barnabas's cousin. (You've already received instructions about Mark - if he comes to you, welcome him warmly!)

The F.O.G Paraphrase

Salute you doth Aristarchus, my fellow-captive, and Marcus, the nephew of Barnabas, (concerning whom ye did receive commands—if he may come unto you receive him,)

Young's Literal Translation