Sifrei_mitzvot for Leviticus 5:5

וְהָיָ֥ה כִֽי־יֶאְשַׁ֖ם לְאַחַ֣ת מֵאֵ֑לֶּה וְהִ֨תְוַדָּ֔ה אֲשֶׁ֥ר חָטָ֖א עָלֶֽיהָ׃

and it shall be, when he shall be guilty in one of these things, that he shall confess that wherein he hath sinned;