Purification Offering for an Ordinary Israelite
By the end of Leviticus 4, priest, congregation, leader, and ordinary Israelite all stand under holiness and all receive a path to atonement/forgiveness. Hebrews later evaluates that whole repeated system, not four secret Christ codes.
Where this fits in the story: Completes the Chapter 4 movement from priest and congregation to leader and ordinary person.
Where Scripture takes it next: Hebrews 10:1–14 applies to the repeated animal-sacrifice system generally; it does not identify the female goat/lamb as a separate prophecy.