Numbers 16:12

וישלח משה וגו׳ AND MOSES SENT [TO CALL DATHAN AND ABIRAM] — From here we may learn that one should not persist in strife (Midrash Tanchuma, Korach 10), for, you see, Moses sought them out in order to conciliate them by peaceful words (Sanhedrin 110a). לא נעלה WE WILL NOT GO UP — Their mouth tripped them up (i.e. unwittingly they made mention of their fate) — that they would have only a “descent” (their words are taken to mean: we shall not be going up; we shall go down into the depths of the earth) (Midrash Tanchuma, Korach 6).

וַיִּשְׁלַ֣ח מֹשֶׁ֔ה לִקְרֹ֛א לְדָתָ֥ן וְלַאֲבִירָ֖ם בְּנֵ֣י אֱלִיאָ֑ב וַיֹּאמְר֖וּ לֹ֥א נַעֲלֶֽה׃

And Moshe sent to call Datan and Aviram, the sons of Eli᾽av; but they said, We will not come up: