procedure not compiling

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

Code:

---

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

Code:

---

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