Charles Spurgeon Commentary Galatians 5:7

"Ye were running well; who hindered you that ye should not obey the truth?" — Galatians 5:7 (ASV)

You Galatians seemed to receive the gospel very readily, and to be very earnest in obeying it; what has caused you to turn aside to the old legal righteousness? You are very changeable, very fickle; you seemed very energetic in running the Christian race; whatever has gotten in your way?

Who did hinder you? Someone must have done so.