Adultery Forbidden

Thou shalt not commit adultery. (Ex. 20: 14.)

Whoremongers and adulterers God will judge. (Heb. 13: 4.)

Marriage or Cohabitation With a Sister Denounced

Cursed is he that lieth with his sister, the daughter of his father, or the daughter of his mother. (Deut. 27: 22.)

And if a man shall take his sister, his father’s daughter, or his mother’s daughter,... it is a wicked thing. (Lev. 20: 17.)