До галатів 1:2

all the brethren--I am not alone in my doctrine; all my colleagues in the Gospel work, travelling with me (Act 19:29, Gaius and Aristarchus at Ephesus: Act 20:4, Sopater, Secundus, Timotheus, Tychicus, Trophimus, some, or all of these), join with me. Not that these were joint authors with Paul of the Epistle: but joined him in the sentiments and salutations. The phrase, "all the brethren," accords with a date when he had many travelling companions, he and they having to bear jointly the collection to Jerusalem [CONYBEARE and HOWSON]. the churches--Pessinus and Ancyra were the principal cities; but doubtless there were many other churches in Galatia (Act 18:23; Co1 16:1). He does not attach any honorable title to the churches here, as elsewhere, being displeased at their Judaizing. See First Corinthians; First Thessalonians, &c. The first Epistle of Peter is addressed to Jewish Christians sojourning in Galatia (Pe1 1:1), among other places mentioned. It is interesting thus to find the apostle of the circumcision, as well as the apostle of the uncircumcision, once at issue (Gal 2:7-15), co-operating to build up the same churches.

In this chapter, after the preface or introduction (Gal 1:1-5), the apostle severely reproves these churches for their defection from the faith (Gal 1:6-9), and then proves his own apostleship, which his enemies had brought them to question, I. From his end and design in preaching the gospel (Gal 1:10). II. From his having received it by immediate revelation (Gal 1:11, Gal 1:12). For the proof of which he acquaints them, 1. What his former conversation was (Gal 1:13, Gal 1:14). 2. How he was converted, and called to the apostleship (Gal 1:15, Gal 1:16). 3. How he behaved himself afterwards (Gal 1:16 to the end).

1:2 the brothers and sisters here join me: Paul probably wrote from Antioch of Syria. Antioch was the hub of Paul’s ministry and the earliest center of Gentile Christianity (see Acts 11:20-26). Paul did not stand alone (as his opponents in Galatia might have suggested), but in fellowship with a significant New Testament church. • The churches of Galatia were probably founded by Paul during his first missionary journey (Acts 13:4–14:26; see Galatians Book Introduction, “Recipients”).