Rashi on Exodus 24:4/רש"י על שמות כ״ד:ד׳

1ויכתב משה AND MOSES WROTE [ALL THE WORDS OF THE LORD] — from בראשית up to (but not including) the account of the Giving of the Torah and he wrote down the commandments that were given to them in Marah (cf. Mekhilta on Exodus 19:10).

2וישכם בבקר AND ROSE UP EARLY IN THE MORNING — on the fifth of Sivan (cf. Rashi on Exodus 19:11) (Shabbat 88a).