Galatians is the apostle Paul’s letter to the churches established in Galatia.
Galatians 1:1 Paul, an apostle, (not of men, neither by man, but by Jesus Christ, and God the Father, who raised him from the dead;) 2 And all the brethren which are with me, unto the churches of Galatia:
For an online commentary on the letter to Galatia go here:
http://www.christadelphianbooks.org/agora/comm/48_gal/index.html
I hope this helps
God bless,
Glenn