Mishnah 17 - Chapter 5 - Pirkei Avot

Kol machaloket shehi leshem shamayim, sofah lehitkayem. Veshe'einah leshem shamayim, ein sofah lehitkayem. Eizo hi machaloket shehi leshem shamayim, zo machaloket hillel veshamma. Veshe'einah leshem shamayim, zo machaloket korach vechol adato.

Every dispute that is for the sake of Heaven, will in the end endure; But one that is not for the sake of Heaven, will not endure. Which is the controversy that is for the sake of Heaven? Such was the controversy of Hillel and Shammai. And which is the controversy that is not for the sake of Heaven? Such was the controversy of Korah and all his congregation.

Every argument which is for the sake of Heaven — the end is [for the parties to that argument] to endure, [as in the argument between Beth Hillel and Beth Shammai, where none of the parties to the argument (the disciples) were lost (as opposed to Korach and his congregation, who were lost). Or: "the end" — the desired end of the argument. In an argument for the sake of Heaven, the desired end is to attain the truth. And this was attained in the argument between Beth Hillel and Beth Shammai — that the halachah is in accordance with Beth Hillel.] And an argument which is not for the sake of Heaven — the [desired] end, [power and love of conquest,] does not endure. [And so we find in the argument of Korach and his congregation. Their end was the attainment of glory and power — and the opposite was what transpired.] What is an argument for the sake of Heaven? The argument between Hillel and Shammai. And (what is an argument) that is not for the sake of Heaven? The argument of Korach and his whole congregation.