ORACLE - select with limiting rows count (..how to show first 5 rows)

select tl_nr, dat_anf from ertest
where
rownum <= 5

Output:

TL_NR                DAT_ANF 
-------------------- --------
S-319-421-1000       12.02.97
-94547-508           12.02.97
-90391-127           12.02.97
-94547-517           12.02.97
-94215-137           12.02.97