Adam Clarke on Colossians 1:2

To the saints - Those who professed Christianity. See the note on Eph 1:1.

Which are at Colosse - Instead of εν Κολοσσαις, at Colosse, or among the Colossians, ABC, and many other excellent MSS., with both the Syriac, Coptic, Slavonic, Origen, Gregory Nyssen, Amphilochus, Theodoret, Damascenus, Theophylact, and others, read εν Κολασσαις in Colassa, or among the Colassians; and this is most probably the true reading. That this city perished by an earthquake, a short time after the date of this epistle, we have the testimony of Eusebius. That which at present is supposed to occupy the site of this ancient city is called Konos. For other particulars see the preface to this epistle.

Grace be unto you - See on Rom 1:7 (note).

And the Lord Jesus Christ - This clause is omitted by many MSS., several versions, and some of the fathers. Griesbach has left it out of the text, not, in my opinion, on sufficient evidence.