Rashi on Leviticus 5:16/רש"י על ויקרא ה׳:ט״ז

1הקדש ישלם‎ מן ‎חטא‎‎ אשר‎ ואת‎ AND FOR THAT WHEREIN HE HATH SINNED IN THE HOLY THING HE SHALL PAY both the principal and the additional fifth to the Temple treasury (cf. Keritot 26b).