The answer is: Leviticus

Leviticus 1:1-2 - Leviticus, the third book of the Torah, primarily focuses on laws and rituals for the Israelite community, enhancing their understanding of holiness. Interestingly, its name stems from "Levitical," relating to the Levites, tasked with priestly duties, a theme echoed throughout the New Testament as Jesus fulfills the ultimate priestly role.