Tosefta for Numbers 16:12

וַיִּשְׁלַ֣ח מֹשֶׁ֔ה לִקְרֹ֛א לְדָתָ֥ן וְלַאֲבִירָ֖ם בְּנֵ֣י אֱלִיאָ֑ב וַיֹּאמְר֖וּ לֹ֥א נַעֲלֶֽה׃

And Moses sent to call Dathan and Abiram, the sons of Eliab; and they said: ‘We will not come up;