Rashi on Leviticus 26:46/רש"י על ויקרא כ״ו:מ״ו

1 והתורת AND THE TORAHS… [WHICH GOD GAVE… IN MOUNT SINAI BY THE HAND OF MOSES] — (The plural is used because there are two Torahs:) one in writing and one by word of mouth (the Oral Law). This verse therefore tells us that all (both) of them were given by God to Moses on Sinai (Sifra, Bechukotai, Chapter 8 10).