וַיֹּ֖אמֶר לֹ֣א תַעֲבֹ֑ר וַיֵּצֵ֤א אֱדוֹם֙ לִקְרָאת֔וֹ בְּעַ֥ם כָּבֵ֖ד וּבְיָ֥ד חֲזָקָֽה׃
그는 가로되 너는 지나가지 못하리라 하고 에돔 왕이 많은 백성을 거느리고 나와서 강한 손으로 막으니
Rashi on Numbers
וביד חזקה AND WITH A STRONG HAND — relying upon our ancestors’ assurance: (Genesis 27:22) “and the hands are the hands of Esau” (cf. Midrash Tanchuma, Beshalach 9 on בשלח)
Siftei Chakhamim
With our grandfather’s assurance. For if not so, why does it say “a strong hand.” Any massive number of people constitutes a strong hand.