Whom I have sent unto you for the same purpose, that he might know your estate, and comfort your hearts; That he might know your estate - Instead of ἱνα γνῳ τα περι ὑμων, that He may know Your affairs, ABD*FG, many others, with the Ethiopic, Itala, Theodoret, and Damascenus, read ἱνα γνωτε τα περι ἡμων, that Ye may know Our affairs; which is probably the true reading. Tychicus was sent to them, not to know their affairs, but with Onesimus, to carry this epistle and make the apostle's state known to them, and comfort their hearts by the good news which he brought. The next verse confirms this meaning.
Related Commentaries of Colossians 4:8
Colossians 4:8
8 Whom I have sent unto you for the same purpose, that he might know your estate, and comfort your hearts;