Rashi on Deuteronomy 6:18/רש"י על דברים ו׳:י״ח

1הישר והטוב [AND THOU SHALT DO] THAT WHICH IS RIGHT AND GOOD [IN THE EYES OF THE LORD] — This refers to a compromise, acting beyond the strict demands of the law (cf. Rashi on Bava Metzia 108a).