Deuteronomy 24:9

Be mindful that no one contemn his neighbour, lest he be smitten: remember that which the Lord your God did to Miriam, who contemned Mosheh for that which was not in him, when she was smitten with leprosy, and you were delayed in the way when coming out of Mizraim.

to Miriam The placement of this verse provides support for the homiletical passage “do not read ‘[the] mǝṣora’”, read rather ‘[the] defamer [Hebrew: moṣi’ shem ra ]’” [Midrash Tanḥuma on Leviticus 14: 2].

REMEMBER WHAT THE ETERNAL THY G-D DID UNTO MIRIAM. “If you wish to guard yourself against being stricken with leprosy, do not speak slander.” This is Rashi’s language. And in my opinion this actually is a positive commandment, like Remember the Sabbath-day, to keep it holy; Remember this day, in which ye came out from Egypt;, 13:3. Remember what Amalek did unto thee — which are all commandments. If so, this verse, too, is like those, it being an admonition against speaking slander. He commanded by way of a positive precept that we remember the great punishment which G-d inflicted upon the righteous prophetess who spoke only about her brother upon whom she had bestowed her mercy and whom she loved as herself. And she spoke nothing wrong to his face, but only, in privacy, between herself and her holy brother [Aaron]. Yet all her good deeds were of no avail to her! You, too, if thou sittest and speakest against thy brother; thou slanderest thine own mother’s son you will not be saved!
In the language of the Sifra:. On Sifra, Sifre, etc. see Vol. IV, p. 46, Note 55. “When Scripture states, and ye will not do all these commandments, this refers to everything written in the Torah. If so, why does it say, And if ye will not hearken unto Me? It means to study the Torah laboriously. Similarly, He states Remember the Sabbath-day, to keep it holy. I might think that this means ‘in your heart.’ But Observe the Sabbath-day refers already to observance of the heart. How then can I fulfill the command Remember [if that also refers to the heart? I must conclude that Remember means] ‘verbal utterance.’ Similarly, it is said Remember, forget thou not, [how thou didst make the Eternal thy G-d wroth in the wilderness] etc. refers to forgetfulness of the heart. How then can I fulfill the command Remember? It means ‘verbal utterance.’” It is thus a positive commandment throughout the generations that we speak of G-d’s mercies upon us etc. (see my Hebrew commentary p. 463). And so it is also said, Remember what the Eternal thy G-d did unto Miriam. I might think that this means ‘in your heart.’ But Take heed in the plague of leprosy, that thou observe diligently, and do refers already to forgetfulness of heart. How then can I fulfill the injunction Remember [if that also refers to the heart? I must conclude that it means] ‘verbal utterance.’ And so also …

בדרך בצאתכם ממצרים, even though segregating her at that time meant that the whole nation would have to remain in an inhospitable desert for an extra seven days, the people did not complain about this. Other, less distinguished people, will certainly not be treated better than was Miriam if they should become afflicted in a similar manner.