Leviticus 5:3

Any bodily discharge, including blood, made a person temporarily unclean (chapters Leviticus 11–15). Being ceremonially unclean was not the same as sin. But if someone ignored their unclean state and did not take the required steps, that became sin because it allowed the impurity to spread. Once a person realized they were unclean, they were guilty if they ignored it.

These verses give examples of sins that required a sin offering (Leviticus 4:2). When a person became aware of committing a wrong, the next step to make it right was to admit the guilt and bring a sin offering.

The sin offering is called khatta’t in Hebrew, from the root khata’. It means "to lack, fall short, miss, fail." The people made this offering when they unintentionally violated specific commands of God (see also Numbers 15:22–29). The purpose of this offering was to repair a loss or fix a failure (for example, Leviticus 5:1–4).

Although all Christians sin, God will forgive us if we confess them (Galatians 6:1; 1 John 1:8–9). Yet, the Scripture warns against sinning "defiantly" or "deliberately" (Numbers 15:30–31; Hebrews 10:26–29; 6:4–6).