NET

18 and must bring a flawless ram from the flock, convertible into silver shekels, for a guilt offering to the priest. So the priest will make atonement on his behalf for his error that he committed (although he himself had not known it) and he will be forgiven.

Darby

18 And he shall bring a ram without blemish out of the small cattle, according to thy valuation, as trespass-offering, unto the priest; and the priest shall make atonement for him concerning his inadvertence wherein he sinned inadvertently, and knew [it] not, and it shall be forgiven him.

KJV

18 And he shall bring a ram without blemish out of the flock, with thy estimation, for a trespass offering, unto the priest: and the priest shall make an atonement for him concerning his ignorance wherein he erred and wist [it] not, and it shall be forgiven him.