And it came about, while Israel was living in that land, that Reuben went and slept with his father’s concubine Bilhah, and Israel heard about it. Now there were twelve sons of Jacob—
Now the sons of Reuben, the firstborn of Israel (for he was the firstborn, but because he defiled his father’s bed, his birthright was given to the sons of Joseph, the son of Israel; so he is not enrolled in the genealogy according to the birthright.
It is actually reported that there is sexual immorality among you, and sexual immorality of such a kind as does not exist even among the Gentiles, namely, that someone has his father’s wife.
‘You shall not covet your neighbor’s wife, nor desire your neighbor’s house, his field, his male slave or his female slave, his ox, his donkey, or anything that belongs to your neighbor.’
as also in all his letters, speaking in them of these things, in which there are some things that are hard to understand, which the untaught and unstable distort, as they do also the rest of the Scriptures, to their own destruction.