Genesis 49:4

Now it happened while Israel was dwelling in that land, that Reuben went and lay with Bilhah his father’s concubine, and Israel heard of it. And there were twelve sons of Jacob—

“May Reuben live and not die, Nor his men be few.”

Now the sons of Reuben the firstborn of Israel (for he was the firstborn, but because he profaned his father’s bed, his birthright was given to the sons of Joseph the son of Israel; so that he is not recorded in the genealogy according to the birthright.