Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[20] Now Corah, when he said this, had a mind to appear to take care of the public welfare, but in reality he was endeavoring to procure to have that dignity transferred by the multitude to himself. Thus did he, out of a malignant design, but with discourse to those of his own tribe; when these words did gradually spread to more people, and when the hearers still added to what tended to the scandals that were cast upon the whole army was full of them. Now of those that conspired with Corah, there were two hundred and fifty, and those of the principal men also, who were eager to have the priesthood taken away from Moses's brother, and to bring him into disgrace: nay, the multitude themselves were provoked to be seditious, and attempted to stone Moses, wad gathered themselves together after an indecent manner, with confusion and disorder. And now all were, in a tumultuous manner, raising a before the tabernacle of God, to prosecute the tyrant, and to relieve the multitude from their slavery under him who, under color of the Divine laid violent injunctions upon them; for had it been God who chose one that was to the office of a priest, he would have raised person to that dignity, and would not produced such a one as was inferior to many others nor have given him that office; and that in he had judged it fit to bestow it on Aaron, he would have permitted it to the multitude to bestow it, and not have left it to be bestowed by his own brother.