Tag_Urit

According to MLB rules... Assume you start the game with the Ohtani rule (same player is DH/Starting Pitcher) which we'll call Player A. Later in the game, another player comes off the bench to pitch but Player A remains as the DH. Can that player, Player A the DH, then come back in to pitch or play a defensive position again later in the game? References to actual MLB rules would be helpful, thanks!