Who instructed Moshe to ascend Har Sinai?
Rashi (in Sanhedrin, 38b): The angel Matatron.
Ramban: Hashem - mentioned in Yisro, 20:19 - now ordered Moshe to ascend Har Sinai. 1
Rashbam: An angel. 2
Until now, Hashem had been instructing Moshe the Mitzvos and Mishpatim to pass on to Yisrael; now He was instructing him what he (Moshe) himself had to do (Ramban).
Moshav Zekenim: The letters of "Mal'achi" (in Pasuk 23) spell Micha'el, the angel that Hashem sent to lead Yisrael.
Moshav Zekenim: Initially Hashem wanted to send Metatron, the judge. However, there is no mercy in judgment, so Moshe requested an angel of mercy, and He sent Micha'el.
Since Hashem was speaking, why did He say "Alei el Hashem, and not 'Alei Elai"?
Rashi (in Sanhedrin, 38b): It was Matatron, whose name is synonymous with His Master, instructing Moshe to go up to Hashem. 1
Ramban #1: It is common practice for the Torah to state the name in place of the pronoun. 2
Ramban #2 (citing Sanhedrin, 38b): It was Hashem instructing Moshe to go up to Matatron, whose name is synonymous with His Master. 3
Refer to 23:21:3:3*
See for example, Bereishis, 4:23, Shmuel 1, 12:11 (Ramban).
Refer to 23:21:3:3*
When was this Parshah said?
Rashi: It was said on the fourth of Sivan (before Matan Torah). 1
Ramban (citing Ibn Ezra), Rashbam, Seforno and Targum Yonasan: On the sixth of Sivan 2 - after Matan Torah. 3
Rashi (in Gitin, 88b): And on the fifth of Sivan, Moshe built a Mizbe'ach, and they brought on it Olos and Shelamim and entered into a covenant via the blood of the Korbanos. See also Sifsei Chachamim. According to the Ramban, this is one opinion in the Mechilta. The Ramban himself explains the Parshah according to the other opinion. Se answer #2.
It therefore transpires that all the Pesukim from Sh'mos 20:19 until 23:33 (known as 'Seifer ha'Beris' are written in the correct order. Moreover, the words of Hashem and the Mishpatim referred to in Pasuk 3 are synonymous with the Aseres ha'Dibros and the Mitzvos of Parshas Mishpatim - and not the Mitzvos of P'rishah and Hagbalah, which were said at Marah, and the seven Mitzvos B'nei No'ach, as Rashi explains there (Ramban). According to the Rashbam, Moshe only ascended after the cloud had covered him for six days (See Rashi in Ki Sisa, Sh'mos 24:16).
Consequently, Pasuk 3 and the first part of Pasuk 4, took place on the same day, and from the second half of Pasuk 4 until Pasuk 11, on the following day, on the seventh of Sivan, when Moshe finally ascended the mountain for forty days (Ramban). It is remarkable that, according to the Ramban, "Na'aseh Venishma" was said after Matan Torah!
If this Parshah was said before Matan Torah, as the Mechilta explains, why did the Torah insert it here and not in Yisro, where it belongs chronologically?
Oznayim la'Torah #1: Bearing in mind that Moshe ascended Har Sinai in order to receive the Luchos in Pasuk 12, is to preempt the question how Hakadosh-Baruch-Hu could favor them after they worshipped the Golden Calf, when Hashem specifically stated in the Aseres ha'Dibros "Lo Yih'ye l'cha Elohim Achreim" and in 22:19 "Zove'ach la'Elohim Yocharam"? Therefore the Torah states the praise of Yisrarel, who declared earlier "Na'aseh Venishma!" - before Moshe went up.
Oznayim la'Torah #2: From the order of the Pesukim it is clear that the covenant that Hashem entered into with Yisrael would only be finalized after Moshe would bring down the Luchos and hand them to Yisrael. Therefore when Moshe smashed them, it energed that the B'ris had not taken place and Yisrael were considered a Penuyah - not married to Hashem as it were, and did not therefore need to be exterminated, as the MIdrashim explain.
Bearing in mind that Elazar and Itamar were on a higher level than the Zekenim - as the Gemara explains in like Eruvin, 54b, why were not told to ascend the mountain?
Moshav Zekenim: Hashem knew that those who ascended (except for Moshe and Aharon) would be Chayav Misah. 1 Consequently, had Elazar and Itamar also ascended, all of Aharon's children would have died. 2
The Zekenim were destined to die at Tav'eirah. According to some opinions, the Zekenim did not approach more than the people. Refer to 5:1:1:1*.
Rashi (Devarim 9:20): Even though initially, Hashem intended to kill all of Aharon's sons, only Moshe's prayer saved Elazar and Isamar, Hashem did not tell them to ascend because He knew that He would accept Moshe's prayer (PF).