Colossians 1:3

Here he proceeds to the body of the epistle, and begins with thanksgiving to God for what he had heard concerning them, though he had no personal acquaintance with them, and knew their state and character only by the reports of others. I. He gave thanks to God for them, that they had embraced the gospel of Christ, and given proofs of their fidelity to him. Observe, In his prayers for them he gave thanks for them. Thanksgiving ought to be a part of every prayer; and whatever is the matter of our rejoicing ought to be the matter of our thanksgiving. Observe, 1. Whom he gives thanks to: To God, even the Father of our Lord Jesus Christ. In our thanksgiving we must have an eye to God as God (he is the object of thanksgiving as well as prayer), and is the Father of our Lord Jesus Christ, in and through whom all good comes to us. He is the Father of our Lord Jesus Christ as well as our Father; and it is a matter of encouragement, in all our addresses to God, that we can look to him as Christ's Father and our Father, as his God and our God, Joh 20:17. Observe, 2.

— Matthew Henry's Concise Commentary (public domain)

Thanksgiving for the "faith, hope, and love" of the Colossians. So in the twin Epistle sent at the same time and by the same bearer, Tychicus (Eph 1:15-16). We--I and Timothy. and the Father--So some of the oldest manuscripts read. But others better omit the "and," which probably crept in from Eph 1:3. praying always for you--with thanksgiving (Phi 4:6). See Col 1:4.

— Jamieson-Fausset-Brown Commentary (public domain)