דברים ל:י פירוש: חזקוני

כי תשמע בקול...כי תשוב, “if you will listen to the voice of Hashem.....and return to the Lord;” we learn here that the time for the redemption from exile depends on two factors, a) penitence, b) performance of both the positive commandments and avoiding the transgressions listed in the negative commandments.

הכתובה, “which has been recorded in writing; we would have expected this word to be in the plural mode as it covers multiple laws. Instead we find a singular feminine mode. This is not something unique; for instance we find something analogous in Exodus 17,12 where Moses’ hands are described as remaining steady, i.e. ויהי ידיו אמונה.