And all the brethren which are with me,.... Meaning either the brethren of the church where he was when he wrote this epistle, who were children of the same Father, regenerated by the same grace, belonged to the same family and household of God, and were heirs together of the grace of life; or else his fellow ministers, who were assisting to him in his work, and were companions with him in his travels, and whom he sometimes mentions by name and joins with him in his epistles, as Sosthenes, Silvanus, and Timothy; and the rather he takes notice of the brethren here, whoever are meant, to show that they agreed with him in the doctrines of grace he defends, and in the charges he brought against this church, and in the reproofs and advice he gave them; which he might suppose, and hope, would have the greater weight and influence upon them;unto the churches of Galatia; Galatia was a country in the lesser Asia, inhabited by the Gauls, who coming thither out of Europe, mixed with the Grecians; whence it was first called Gallo Graecia, and afterwards Galatia; See Gill on "Ac 16:6".
The metropolis of it, as Pliny says, was formerly Gordium, and the chief towns or cities, according to him, were Ancyra, Tavium, and Pessinus; and in some, or all of these places, it is very probable, were the churches here mentioned; See Gill on "Ac 18:23".
It seems there were more than one in this country; for the primitive churches were not national nor provincial, but congregational, consisting of persons called out of the world, and joined together in holy fellowship and who walked in the commandments and ordinances of the Lord: and though these churches had many among them that were disorderly, and were swerving from the faith of the Gospel, yet were not unchurched, but honoured still with the name of churches, there being no perfection to be expected in this state of things; as not in particular persons, so not in congregated bodies and societies; though it is observed by some, that they are barely called churches, without any additional epithets, as churches of God, beloved of God, called to be saints, faithful and sanctified in Christ, which are bestowed on other churches; whereby the apostle is thought to show his indignation and resentment at their principles and practices.
For quickly after the Gospel was preached unto them, false teachers crept in among them, endeavouring to subvert it, by mixing it with the law, and joining Moses and Christ; and in which they very much succeeded; and is the reason of the apostle's writing this epistle.
Nat. Hist. l. 5. c.