None of you, &c.— Improper and incestuous marriages, which were extremely common, not only among the Egyptians and Canaanites, but other Eastern idolaters, are here first prohibited. There were to be no marriages between those who were near of kin. The word שׁאר sheir, denotes cosanguinity. For the best comment on this chapter, we refer to Grotius de Jur. Bell. & Pacis, lib. 2: cap. 5.
Related Commentaries of Leviticus 18:6
Leviticus 18:6
6 None of you shall approach to any that is neara of kin to him, to uncover their nakedness: I am the LORD.