Leviticus 4 gives the worshiper-facing procedure for a leader’s purification offering when he sins inadvertently. Leviticus 6 returns to the purification-offering category and gives priestly handling, eating, holiness, and disposal rules. The later passage therefore completes the same sacrificial system from the priest’s operational perspective.

Leviticus 4 provides purification offerings for individuals, including leaders, who sin inadvertently. Numbers 15 develops the same Torah distinction by giving a sacrifice for an individual’s unintentional violation while contrasting defiant high-handed sin. The passages therefore clarify the scope of inadvertent-sin sacrifice across the Torah.

Foreshadowing / mirroring — strong but debated lexical-canonical echo: Romans 8:3 says God sent his own Son “for sin” (Greek peri hamartias), wording the Septuagint repeatedly uses for Levitical sin/purification offerings. This gives Christ a serious sacrificial correspondence to Leviticus 4, while interpreters debate whether Paul foregrounds the technical “sin offering” sense here.