Colossians 4:10

"My fellow prisoner Aristarchus sends you his greetings, as does Mark, the cousin of Barnabas. (You have received instructions about him; if he comes to you, welcome him.)" NIV translation

Aristarchus was from Thessalonica and had been a member of Paul's missionary team. He had been arrested in Ephesus when the riot broke out (see Acts 19). Mark (also known as John Mark) is a beautiful example of God's restoration power. In Acts 15, we saw a disagreement between Barnabas and Paul concerning this man and they, in fact, parted ways for a time. 

Now, we see that the relationship has been restored and they are in fact on the same team working for the Lord.

Colossians 4:11

"Jesus, who is called Justus, also sends greetings. These are the only Jews among my fellow workers for the kingdom of God, and they have proved a comfort to me." NIV translation

We see that there were only a few Jews on this ministry team and we remember that most of them believed that they were God's chosen people and that nobody else could be included in the family of God. Surely, it was a comfort to Paul in knowing that some of his people (he was a Jew) were being saved through Jesus Christ. It is also interesting to note that this man Justus did not use his given name "Jesus" out of respect for the name given to the Son of God. In our world today, the name of Jesus is thrown about and even trampled as a curse word but we must remember that there is no other name in heaven or earth by which we can be saved. If we believe that, then, we should show the same respect to His name.