The Apostle Paul
Ephesians 6:21BSB·traditional attribution

Tychicus, the beloved brother and faithful servant in the Lord, will tell you everything, so that you also may know about me and what I am doing.

John Calvin Reformed @genevareformer

21. But that, ye also may know. Uncertain or false reports frequently produce uneasiness, chiefly, no doubt, in weak minds, but sometimes also in thoughtful and steady persons. To prevent this danger, Paul sends Tychicus, from whom the Ephesians would receive full information.

Matthew Henry Presbyterian @wholebiblehenry

Here, I. He desires their prayers for him, Eph 6:19. Having mentioned supplication for all saints, he puts himself into the number. We must pray for all saints, and particularly for God's faithful ministers. Brethren, pray for us, that the word of the Lord may run and be glorified.

Commenting on Ephesians 6:19-24

John Gill Reformed Baptist @doctorgill

But that ye also may know my affairs, and how I do,.... Both his temporal and spiritual affairs; as that he was in bonds, and how he was supported under them, and of what use they were to others; how that he preached in his own hired house, and with what success; and what ministering brethren he had with him to assist him; and in...