Rashi on Deuteronomy 5:16/רש"י על דברים ה׳:ט״ז

1כאשר צוך [HONOUR THY FATHER AND THY MOTHER] AS THE LORD THY GOD HATH COMMANDED THEE — Also regarding honouring parents they received command at Marah, as it is said, (Exodus 15:25) “There He appointed for them a statute and a judgement” (cf. Rashi on that passage and Note p. 243) (Sanhedrin 56b).