Numbers 15:8
And when thou preparest a bullock for a burnt offering, or for a sacrifice in performing a vow, or peace offerings unto the LORD: And when thou preparest a bullock for a burnt offering, or for a sacrifice in performing a vow, or peace offerings unto the LORD:
Numbers 15 stands as a collection of various laws, and this instruction about preparing a bullock belongs among them in a chapter that also records a man who broke the fourth commandment presumptuously. That Sabbath-breaking was not treated as mere transgression but as open, daring, Heaven-defying sin.
A sin done without knowledge does not cease to be sin, and it still calls for atonement to be made. Such ignorance does not place the act beyond remedy, for atonement can be made and forgiveness obtained. A person may commit the wrong without knowing it at the time, yet once the sin becomes known to him he is counted guilty. He must then bring what is required, here a bullock for a burnt offering or for performing a vow or for peace offerings unto the LORD, and without that offering the sin remains upon him unforgiven.