יצאו נצבים. בְּקוֹמָה זְקוּפָה — לְחָרֵף וּלְגַדֵּף, כְּמוֹ (שמואל א י"ז) "וַיִּתְיַצֵּב אַרְבָּעִים יוֹם" דְּגָלְיָת (תנחומא): יצאו נצבים [AND DATHAN AND ABIRAM] CAME OUT, STATIONING THEMSELVES [AT THE ENTRANCE OF THEIR TENT] — The word נצבים suggests that they stood with erect stature in a challenging attitude, ready to revile and to curse. The phrase is similar in meaning to (I Samuel 17:16) “And he stationed himself (ויתיצב) there for forty days”, which occurs in the story of Goliath (Midrash Tanchuma, Korach 3).
ונשיהם ובניהם וטפם. בֹּא וּרְאֵה כַּמָּה קָשָׁה הַמַּחֲלֹקֶת, שֶׁהֲרֵי בֵית דִּין שֶׁל מַטָּה אֵין עוֹנְשִׁין אֶלָּא עַד שֶׁיָּבִיא שְׁתֵּי שְׂעָרוֹת, וּבֵית דִּין שֶׁל מַעְלָה עַד עֶשְׂרִים שָׁנָה, וְכָאן אָבְדוּ אַף יוֹנְקֵי שָׁדַיִם (שם): ונשיהם ובניהם וטפם AND THEIR WIVES, AND THEIR SONS, AND THEIR LITTLE ONES — Come and see how grievous a sin dissension is: for an earthly tribunal (more lit., a tribunal of here below) does not punish a person before he shows signs of puberty, the heavenly tribunal (more lit., the tribunal of above) not even before he is twenty years old, while here even the sucklings perished (Midrash Tanchuma, Korach 3).