כַּ֭מַּיִם הַפָּנִ֣ים לַפָּנִ֑ים כֵּ֤ן לֵֽב־הָ֝אָדָ֗ם לָאָדָֽם׃
Comme dans l’eau le visage répond au visage, ainsi chez les hommes les cœurs se répondent.
Rashi
As in water the face that you show it, it shows you.
Rashi
is the heart of a man to a man his friend. According to how much a man knows that his friend loves him, so he will show him his face.