Ephesians
King James Version (KJV)

“I therefore, the prisoner of the Lord, beseech you that ye walk worthy of the vocation wherewith ye are called,”
King James Version (KJV)
4:1 I therefore, the prisoner of the Lord - Imprisoned for his sake and for your sakes; for the sake of the gospel which he had preached amongst them. This was therefore a powerful motive to them to comfort him under it by their obedience.
Eph 4:1 The Unity of the Church SUMMARY OF EPHESIANS 4: The Exhortation to Unity. The Seven Bonds of Unity. The Various Gifts Given to the Church. The Offices for Its Edification. The Church Compacted in Christ. The Gentiles Called from Their Former Lives. A New and Holy Life Commanded. I, therefore. Practical duties are now urged which grow out of their glorious privileges in Christ. The prisoner of the Lord. See PNT "Eph 3:1". Compare Phm 1:9. He was a prisoner because he was a servant of the Lord. Walk worthy of the vocation wherewith ye are called. They had been called to a glorious calling, as he had shown in chapter 3. The Christian has been called to the highest calling with which man has ever been honored.