Comentário sobre Êxodo 24:4

ויכתב 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).

ויכתב משה את כל דברי ה', “Moses wrote down all the words of the Lord.” This refers to the conditions spelled out in 19,5: “it will be if you listen to My voice, etc.”
וישכם בבוקר ויבן מזבח תחת ההר, “he arose early in the morning and erected an altar beneath the mountain.” This occurred on the fifth day of Sivan.
כל הדברים אשר דבר ה' נעשה, “all the words the Lord has said we shall do.” Rabbeinu Chananel writes that the word נעשה includes the positive and the negative commandments. The reason for this is simple. Anyone who deliberately refrains from violating a negative commandment thereby performs a positive commandment. There is an explicit verse in Psalms 119,3 making precisely this point. The psalmist says: “they have done no wrong but have followed His ways.”

On the fifth of Sivan. Rashi writes this to inform us that Moshe’s ascent to the mountain with Nadav and Avihu and the elders, to receive the Torah, was on the day following this: the 6th of Sivan. [Thus, Rashi is explaining it] not like R. Yosei, who said that it was on the 7th.