Rashi on Deuteronomy 30:11/רש"י על דברים ל׳:י״א

1לא נפלאת הוא ממך [FOR THIS COMMANDMENT …] IS NOT נפלאת FROM YOU i.e. is not concealed from you, just as it is said, (Deuteronomy 17:8): כי יפלא which is rendered in the Targum by “If there be concealed [from thee]”; and (Lamentations 1:9): ותרד פלאים which means, she went down into concealment, i.e. being covered and bound in the place of concealment.