“unintentionally.” The sin offering and trespass offering were for unintentional sins. If a person sinned on purpose, willfully, defiantly, he was to be “cut off” from his people (Num. 15:30-31). That is why we sometimes see the wrath of God fall on people in the Old Testament, such as on Aaron’s sons who disobeyed God about the offerings (Lev. 10:1-2), or when the ground opened up and swallowed Korah and the rest of the leaders who rebelled against God and Moses (Num. 16:1-2, 31-35).

If a person sinned intentionally, and had no intention of repenting, then their life was in danger from God, the Devil, or people. However, we all sometimes sin intentionally, and God is gracious and so often there are no immediate consequences for that sin; but there certainly will be on the Day of Judgment unless the person repents and God accepts their asking for His forgiveness (cp. 1 John 1:9 and note the record of the tax collector in Luke 18:13).