Comentario citado sobre Números 16:29

“And Korah took” - This matter that was in the wilderness of Sinai, when the firstborns were replaced and the Levites were separated,
For the Israelites thought that Moshe our Leader did it according to his own thought, to give greatness to his brother, and also to the sons of Kehat for they are close to him, and all of the Levites that they are his family.
And the Levites conspired against him because they were given to Aaron and his sons.
Datan and Aviram conspired because the firstborn privilege was removed from Reuven their father and given to Yosef; perhaps they suspected that [Moshe did that] for the sake of Yehoshua his servant [who was from Yosef].
Also Korah was a first born, for thus was written.
>And those Heads of the Congregation (edah) were firstborns and they were bringing the olah offerings.
And the proof for this explanation is the miracle of the staff (Bamidbar 17:16-26) that all of Israel saw that Hashem chose the tribe of Levi in place of the firstborns, and therefore it is written (Bamidbar 17:25) “their mutterings ceased,” for the mutterings were about this.
Also Moshe said that “it is not from my own mind” (Bamidbar 26:28), because they suspected that it was from his own mind that he did it.
And further proof is “Hashem did not send me” - for this task - because all the Israelites already believed in him [in general]. Another total proof is “all the congregation are holy” and this is a hint to the firstborns that they are holy, because it is written (shemot 13:2) “sanctify to Me every first born” and they are the priests (Kohanim) that approach Hashem and they are the essence of the whole congregation.

until I remember him The remembrance of all mankind. That is death.

שבתון שבת קודש לה' מחר, “a rest day, a holy Sabbath for the Lord tomorrow.” According to the plain meaning of the text the reason why the word Sabbath is repeated is because there are two distinct aspects to each and every Sabbath. One is to do with the עומר, which will be dealt with in verse 29, the other with the special מוסף offering which was offered in the Temple on every Sabbath accompanied by the recital of a special hymn (Psalm 92) sung by the Levites on that occasion.

And You have turned their hearts away. You gave them an opportunity to turn away from following You, although You could have directed their hearts toward You.²³See Maseches Berachos 31b. Alternatively, “You misled them by occasionally allowing their idolatrous prayers to be effective.”—Ralbag Or, Eliyahu is referring to the future and is saying, “When You answer my prayer and send down fire, You will have turned their hearts away from the Baal and back to You.”—Radak in the name of Rav Sa’adyah Gaon And according to Midrash Aggadah, if You do not answer me, I will deny and say that You turned their hearts. And so did Moshe say, “If as all men die will these men meet their death,”²⁴Bamidbar 16:29. I, too, will deny and say, “then Adonoy has not sent me,”²⁵Ibid. to speak [the words of] the Torah and the commandments, and so did Michoyhu say, “If you really return in peace, Adonoy did not speak to me.”²⁶Below 22:28.