Albert Barnes Commentary Galatians 5:18

"But if ye are led by the Spirit, ye are not under the law." — Galatians 5:18 (ASV)

But if you are led of the Spirit. If you submit to the teachings and guidance of the Holy Spirit.

You are not under the law. You are under a different dispensation—the dispensation of the Spirit. You are free from the restraints and control of the Mosaic law, and are under the control of the Spirit of God.