Rashi on Deuteronomy 24:18/רש"י על דברים כ״ד:י״ח

1וזכרת BUT THOU SHALT REMEMBER [THAT THOU WAST A SERVANT IN EGYPT AND THE LORD THY GOD RELEASED THEE THENCE] — I released you only with this condition — that you should observe my statutes even though there be monetary loss in the matter.