וַיֹּ֖אמֶר לֹ֣א תַעֲבֹ֑ר וַיֵּצֵ֤א אֱדוֹם֙ לִקְרָאת֔וֹ בְּעַ֥ם כָּבֵ֖ד וּבְיָ֥ד חֲזָקָֽה׃
And he said: ‘Thou shalt not pass through.’ And Edom came out against him with much people, and with a strong hand.
Read midrashic interpretation of Numbers 20:20: and classical rabbinic exegesis.