Albert Barnes' Bible Commentary
Leviticus 12 - Introduction
Lev 12–15. Ceremonial Purifications
The Purifications of the Law fall under three heads;
(1). Those for defilement arising from secretions;
(2). Those for the leprosy;
(3). Those for pollution from corpses.
The first and second classes are described in these chapters; the last, as relates to human corpses, in Numbers 19:11, etc., and as relates to the bodies of dead animals, in Leviticus 11:24, Leviticus 11:31.