Numbers 15:10
And thou shalt bring for a drink offering half an hin of wine, for an offering made by fire, of a sweet savour unto the LORD. And thou shalt bring for a drink offering half an hin of wine, for an offering made by fire, of a sweet savour unto the LORD.
The half-hin measure of wine is prescribed as the drink offering to accompany an offering made by fire, an offering of sweet savour to the Lord. It belongs to the instructions for meal offerings and drink offerings and for offerings for sins of ignorance given during the wilderness journey. Within that setting it stands as part of the Mosaic law dealing with atonement for sin committed in ignorance.
A sin committed in ignorance is still sin and requires atonement, and without that atonement the sin remains. A person may sin without knowing it, but when the sin becomes known to him he is counted guilty and must present the required offering in order to be forgiven.
Numbers 15 illustrates a special and temporary class of subsidiary laws given through Moses, adapted to that people, time, and wilderness environment, such as sanitary or police regulations. This is seen in its provision for a flagrant case of presumptuous sin in the stoning of the man who defiantly gathered sticks on the Sabbath. Such laws are easily distinguishable from the eternal constitution of divine government epitomized in the Ten Commandments and summarized as love to God and neighbor.