Who is this person named "Rei" in the Haftarah of Parashat Chayei Sarah?
Melachim I - I Kings - Chapter 1:8 And Zadok the priest and Benaiahu the son of Jehoiada, and Nathan the prophet, and Shimei and Rei, and the mighty men, who were with David, were not with Adoniahu.
https://www.chabad.org/library/bible_cdo/aid/15885/showrashi/true
The name "Rei" appears suddenly in this Haftarah passage and gives an impression that the readers know who this person is.