Is COMMIT required after every EXECUTE IMMEDIATE?

I have multiple EXECUTE IMMEDIATE commands within one oracle procedure.

EXECUTE IMMEDIATE 'DELETE  FROM tbl1'; 
EXECUTE IMMEDIATE 'INSERT INTO tbl1...'; 
COMMIT;
EXECUTE IMMEDIATE 'DELETE  FROM tbl3'; 
EXECUTE IMMEDIATE 'INSERT INTO tbl3 ...'; 
COMMIT;
EXECUTE IMMEDIATE 'DELETE  FROM tbl4'; 
EXECUTE IMMEDIATE 'INSERT INTO tbl4 ...';
COMMIT; 

Do I need all of these COMMIT, or just at the end of the procedure?