Зна́ет ко́шка, чьё мя́со съе́ла.
Transliteration: Znayet koshka, ch’yo myaso s’yela.
Translation: The cat knows whose meat it has eaten.
English equivalent: A guilty conscience needs no accuser.
Meaning: “People who know they have done wrong
reveal their guilt by the things they say
or the way they interpret what other people say.”