A.T. Robertson Commentary Galatians 5:3

"Yea, I testify again to every man that receiveth circumcision, that he is a debtor to do the whole law." — Galatians 5:3 (ASV)

A debtor (οφειλετης). Common word from οφειλω, to owe for one who has assumed an obligation. See on Mt 6:12. See Ga 3:10. He takes the curse on himself.