וַיֵּ֧רֶד מֹשֶׁ֛ה מִן־הָהָ֖ר אֶל־הָעָ֑ם וַיְקַדֵּשׁ֙ אֶת־הָעָ֔ם וַֽיְכַבְּס֖וּ שִׂמְלֹתָֽם׃
Lalu Musa turun dari gunung itu kepada umat itu dan mempersiapkan umat itu, dan mereka mencuci pakaian mereka.
Shenei Luchot HaBerit
זאת חקת התורה . Why did the Torah need this introduction? This is adequately explained by Eliyahu Mizrachi. There are numerous occasions in the Torah when such an introduction is used, e.g. זאת חקת הפסח, in Exodus 12,43. Even though the law is not in the nature of גזרה היא מלפני, "it is a decree that I have decreed," seeing that the reasons for this legislation have been explained, the Torah's expression here is in a class by itself since we have both the expression חוק and תורה. Surely one of these words is unnecessary. Later, while still discussing the same subject matter, the Torah writes: זאת התורה, אדם כי ימות באהל "This is the Torah concerning a person who dies in a tent, etc." (19,14). At the beginning of our פרשה, it would also have sufficed to write only one of these expressions. In the example before us, the words “Torat,” or “Chukat,” mean that the Torah is about to reveal certain commandments to us. I believe that this question is answered adequately without the Mizrachi pointing out that we are faced here with what seems to be a repetition. We read in Exodus 12, 14: חקת עולם תחגהו, "you shall celebrate is as a statute forever." The Torah sometimes speaks of the Passover as חקת הפסח. This means the expression חק is also tied to certain time frames such as חקך וחק בניך, in Leviticus 10,13, where the consumption of certain sacrifices is discussed. In that instance the time this statute applies is limited. Similarly the statute of the Passover is severely limited in the time it applies. We find the expression חק, even when dealing with social laws, משפטים, such as in Exodus 18,16, where Moses tells his father-in-law that he explains the Torah's litigation laws to those who approach him with complaints. The word חק implies something fixed, whether in quantity or time.
Shenei Luchot HaBerit
This is the reason why we also find the revelation at Mount Sinai and the giving of the Torah alluded to in this dream, as mentioned in Bereshit Rabbah 68, 12. We read there that the words "the ladder stood on the ground, its head reaching heavenwards," describe the ladder as at the foot of Mount Sinai, with its top reaching into the fiery mountain top up unto the heart of Heaven, as described in Deut. 4,11. Another version in the same Midrash points out that the numerical value of the letters in the word סלם, ladder, is equal to the numerical value of the letters in the word 130= סיני. The מלאכי אלוקים, heavenly messengers, are perceived as Moses and Aaron. Proof that prophets are called מלאכים is found in Chagai 1,13: ויאמר חגי מלאך ה' במלאכות ה' לעם. "Chagai, the angel of the Lord, fulfilling the Lord's mission, spoke to the people." When the angels are described as עולים, ascending, this refers to Moses of whom the Torah wrote (Exodus 19,3): ומשה עלה אל האלוקים, Moses ascended to G–d." When the Torah describes the angels as descending the ladder, it also refers to Moses, of whom the Torah wrote: וירד משה, Moses descended (Exodus 19,14). Next, G–d is described in the dream as standing above the ladder, and we know that "G–d descended to the top of Mount Sinai" (Exodus 19,20). Thus far the two versions of the Midrash.