procedure not compiling

[prodadmin]

i am writing simple procedure but its erroring out due to alter
this is on logical standby

create or replace PROCEDURE pr_test
as 
begin
  declare
    user       VARCHAR2(50 BYTE);
     adfg      VARCHAR2(50 BYTE);
    
  begin
   alter session disable guard;
insert into AUDIT values (  user,adfg,sysdate);
commit;
alter session enable guard;
end;
end;

it throws the following error

SQL> show errors
Errors for PROCEDURE PR_LOGACCESS:
LINE/COL ERROR
-------- -----------------------------------------------------------------
8/4      PLS-00103: Encountered the symbol "ALTER" when expecting one of
         the following:
         begin case declare exit for goto if loop mod null pragma
         raise return select update while with 
           <<
         close current delete fetch lock insert open rollback
         savepoint set sql execute commit forall merge pipe

any help is appreciated