Tafsiran Bilangan 16:23: Kli Yakar

And the Lord spoke to Moses, saying: Speak to the congregation, saying: Get away from around the dwelling of Korah. Never did it enter My mind to punish the entire congregation. On the contrary, I know that they were not persuaded by Korah. And what I said, Separate yourselves from the midst of this congregation, I was referring to all of Israel, that they should separate themselves from the congregation of Korah. And the proof for this is from what was first said, And the Lord spoke to Moses and Aaron, saying. What does saying mean? To whom should they say this? Rather, God wanted them to tell all of Israel to separate themselves. And Moses did not understand the words of the Holy One, blessed be He, because the word saying can be the Torah’s statement referring to what would be in the end. But further on it says, Rise up from the midst of the congregation, etc. For there it says, When the congregation gathered against Moses, etc. Because there they truly gathered against them, therefore He said to Moses and Aaron, Rise up — a language of elevation appropriate for Moses and Aaron according to their level. But here He said “Separate yourselves,” for He was saying this to all of Israel, as the language of elevation is not appropriate for the entire congregation, as mentioned. And Moses did not understand this from the difference in language, because he had not yet heard the statement Rise up.
And proof for our words that rise up is not a language of separation is that it says afterward, and go quickly to the congregation — which implies that they were not among them. So what does rise up mean? Rather, it is a language of elevation, because all of them went down to Sheol, but for you the greatness and elevation will remain, for you will become a mighty people in order to fulfill the oath.
And Ramban wrote something close to this interpretation in the name of Rabbi Chananel, and from there you can see what I have added of my own to his words, for with them many questions are resolved.

And the Lord spoke to Moses, saying: Speak to the congregation, saying: Get away from around the dwelling of Korah. Never did it enter My mind to punish the entire congregation. On the contrary, I know that they were not persuaded by Korah. And what I said, Separate yourselves from the midst of this congregation, I was referring to all of Israel, that they should separate themselves from the congregation of Korah. And the proof for this is from what was first said, And the Lord spoke to Moses and Aaron, saying. What does saying mean? To whom should they say this? Rather, God wanted them to tell all of Israel to separate themselves. And Moses did not understand the words of the Holy One, blessed be He, because the word saying can be the Torah’s statement referring to what would be in the end. But further on it says, Rise up from the midst of the congregation, etc. For there it says, When the congregation gathered against Moses, etc. Because there they truly gathered against them, therefore He said to Moses and Aaron, Rise up — a language of elevation appropriate for Moses and Aaron according to their level. But here He said “Separate yourselves,” for He was saying this to all of Israel, as the language of elevation is not appropriate for the entire congregation, as mentioned. And Moses did not understand this from the difference in language, because he had not yet heard the statement Rise up.
And proof for our words that rise up is not a language of separation is that it says afterward, and go quickly to the congregation — which implies that they were not among them. So what does rise up mean? Rather, it is a language of elevation, because all of them went down to Sheol, but for you the greatness and elevation will remain, for you will become a mighty people in order to fulfill the oath.
And Ramban wrote something close to this interpretation in the name of Rabbi Chananel, and from there you can see what I have added of my own to his words, for with them many questions are resolved.