Rangers (and Monks) in AD&D 1e both get 2 Hit Dice at 1st level. If they have a Constitution bonus, they also get it twice at first level, giving Rangers a potential of 24 HPs to start out with (they get D8 for HD, not D10 like fighters and paladins.
I don't recall how it was for the ranger and monk in the OD&D supplements, but I've always wondered why these two classes started out with extra hit points at first level.
Was there ever a stated reason?
Succubus Sunday - Source
1 hour ago