Colossians 3:18

The apostle concludes the chapter with exhortations to relative duties, as before in the epistle to the Ephesians. The epistles which are most taken up in displaying the glory of divine grace, and magnifying the Lord Jesus, are the most particular and distinct in pressing the duties of the several relations. We must never separate the privileges and duties of the gospel religion. I. He begins with the duties of wives and husbands (Col 3:18): Wives, submit yourselves unto your own husbands, as it is fit in the Lord. Submission is the duty of wives, hupotassesthe. It is the same word which is used to express our duty to magistrates (Rom 13:1, Let every soul be subject to the higher powers), and is expressed by subjection and reverence, Eph 5:24, Eph 5:33. The reason is that Adam was first formed, then Eve: and Adam was not deceived, but the woman, being deceived, was in the transgression, Ti1 2:13, Ti1 2:14. He was first in the creation and last in the transgression. The head of the woman is the man; and the man is not of the woman, but the woman of the man; neither was the man created for the woman, but the woman for the man, Co1 11:3, Co1 11:8, Co1 11:9. It is agreeable to the order of nature and the reason of things, as well as the appointment and will of God.

— Matthew Henry's Concise Commentary (public domain)

unto your own husbands--The oldest manuscripts omit "own," which crept in from Eph 5:22. as it is fit in the Lord--Greek, "was fit," implying that there was at Colosse some degree of failure in fulfilling this duty, "as it was your duty to have done as disciples of the Lord."

— Jamieson-Fausset-Brown Commentary (public domain)