THROW 50001, 'Error message', 1;

begin try 
  select 'using throw'
  select 1 / 0  
end try 
begin catch 
  --throw error 
  throw
end catch

(1 row(s) affected)

 (0 row(s) affected)

Msg 8134, Level 16, State 1, Line 3

Divide by zero error encountered.