Numbers 15:4
Then shall he that offereth his offering unto the LORD bring a meat offering of a tenth deal of flour mingled with the fourth part of an hin of oil. Then shall he that offereth his offering unto the LORD bring a meat offering of a tenth deal of flour mingled with the fourth part of an hin of oil.
The verse prescribes what counts as an acceptable offering to the Lord, namely that the one bringing his offering is to bring a grain offering of a tenth deal of flour mixed with a fourth part of a hin of oil. It belongs to the Mosaic law that governed offerings for sin committed in ignorance. Even sin done in ignorance is still sin and requires atonement, and sins committed in ignorance can be atoned for. When such sin becomes known the person stands guilty and needs the prescribed offering in order to obtain forgiveness, and forgiveness can be made through that provision.
The chapter in which the verse stands also shows Sabbath breaking to be a sin abhorrent to God. It illustrates flagrant presumptuous sin by the stoning of the man who in defiance gathered sticks on the Sabbath. The regulation is a temporary sanitary or police measure adapted to Israel in that time and wilderness environment, easily distinguishable from the eternal Decalogue as the constitution of God's government.