Rashi on Leviticus 4:6/רש"י על ויקרא ד׳:ו׳

1את פני פרכת הקדש [AND THE PRIEST SHALL … SPRINKLE OF THE BLOOD …] BEFORE THE PARTITION VAIL OF THE קדש — i.e. before that spot where it is exceedingly holy — exactly in front of the space between the staves of the Ark (Sifra, Vayikra Dibbura d'Chovah, Section 3 10). The blood did not touch the Partition Vail (since he was standing some distance off), but if it happened to touch it, then it touched it, (and it did not invalidate the ceremony) (Yoma 57a).