for until the law sin was in the world; but sin is not imputed when there is no law.

Because, till the law came, sin was in existence, but sin is not put to the account of anyone when there is no law to be broken.

διοτι μεχρι του νομου ητο εν τω κοσμω η αμαρτια, αμαρτια ομως δεν λογιζεται οταν δεν ηναι νομος·

(For until the law sin was in the world: but sin is not imputed when there is no law.