Paul continues to correct the Galatian's confused understanding of salvation. He reminds them that their righteousness doesn't come through keeping God's law, but by hearing the Gospel in faith and trusting in Christ's sacrifice on the cross.

Galatians 3:1–6

By Faith, or by Works of the Law?

3:1 O foolish Galatians! Who has bewitched you? It was before your eyes that Jesus Christ was publicly portrayed as crucified. 2 Let me ask you only this: Did you receive the Spirit by works of the law or by hearing with faith? 3 Are you so foolish? Having begun by the Spirit, are you now being perfected by¹ the flesh? 4 Did you suffer² so many things in vain—if indeed it was in vain? 5 Does he who supplies the Spirit to you and works miracles among you do so by works of the law, or by hearing with faith—6 just as Abraham “believed God, and it was counted to him as righteousness”?

Footnotes

[1] 3:3 Or now ending with
[2] 3:4 Or experience

(ESV)