The English name is from the Latin Leviticus, taken in turn from Greek and a reference to the Levites, the tribe from whom the priests were drawn.
Leviticus is not, however, a manual for priests, as it concerns itself at least equally with the role and duties of the laity.
Leviticus rests on two crucial beliefs: the first, that the world was created "very good" and retains the capacity to achieve that state although it is vulnerable to sin and defilement; the second, that the faithful enactment of ritual makes God's presence available, while ignoring or breaching it compromises the harmony between God and the world.
The traditional view is that Leviticus was compiled by Moses, or, in less extreme form, that the material in it goes back to his time.
However, the tradition is comparatively late (it dates from Josephus, a 1st century CE historian), and scholars are practically unanimous that the book had a long period of growth, that it includes some material of considerable antiquity, and that it reached its present form in the Persian period (538-332 BCE).
Tzav, on Leviticus 6-8: Sacrifices, ordination of the priests
Shemini, on Leviticus 9-11: Tabernacle consecrated, alien fire, dietary laws
Tazria, on Leviticus 12-13: Childbirth, skin disease, clothing
Metzora, on Leviticus 14-15: Skin disease, infected houses, genital discharges
Acharei, on Leviticus 16-18: Yom Kippur, centralized offerings, sexual practices
Kedoshim, on Leviticus 19-20: Holiness, penalties for transgressions
Emor, on Leviticus 21-24: Rules for priests, holy days, lights and bread, a blasphemer
Behar, on Leviticus 25-25: Sabbatical year, debt servitude limited
Bechukotai, on Leviticus 26-27: Blessings and curses, payment of vows
I. Laws on sacrifice (1:1-7:38)
A. Instructions for the laity on bringing offerings (1:1-6:7)
1-5. The types of offering: burnt, cereal, peace, purification, reparation (or sin) offerings (ch.1-5)
B. Instructions for the priests (6:1-7:38)
1-6. The various offerings, with the addition of the priests' cereal offering (6:1-7:36)
7. Summary (7:37-38)
II. Institution of the priesthood (8:1-10:20)
A. Ordination of Aaron and his sons (ch.8)
B. Aaron makes the first sacrifices (ch.9)
C. Judgement on Nadab and Abihu (ch.10)
III. Uncleanliness and its treatment (11:1-16:24)
A. Unclean animals (ch.11)
B. Uncleanness caused by childbirth (ch.12)
C. Unclean diseases (ch.13)
D. Cleansing of diseases (ch.14)
E. Unclean discharges (ch.15)
F. Purification of the tabernacle from uncleanness (ch.16)
IV. Prescriptions for practical holiness (the Holiness Code - ch. 17:1-26)
A. Sacrifice and food (ch.17)
B. Sexual behaviour (ch.18)
C. Neighbourliness (ch.19)
D. Grave crimes (ch. 20)
E. Rules for priests (ch. 21)
F. Rules for eating sacrifices (ch.22)
G. Festivals (ch.23)
H. Rules for the tabernacle (ch.24:1-9)
I. Blasphemy (ch.24:10-23)
J. Sabbatical and Jubilee years (ch.25)
K. Exhortation to obey the law: blessing and curse (ch.26)
V. Redemption of votive gifts (ch.27)

