וְהָיָה֩ בֵית־יַעֲקֹ֨ב אֵ֜שׁ וּבֵ֧ית יוֹסֵ֣ף לֶהָבָ֗ה וּבֵ֤ית עֵשָׂו֙ לְקַ֔שׁ וְדָלְק֥וּ בָהֶ֖ם וַאֲכָל֑וּם וְלֹֽא־יִֽהְיֶ֤ה שָׂרִיד֙ לְבֵ֣ית עֵשָׂ֔ו כִּ֥י יְהוָ֖ה דִּבֵּֽר׃
雅各家必成為火，約瑟家必成為火焰，以掃家必成為碎稭；火必燒著他們，將他們吞滅；以掃家必無一人倖存，因為這是永恆者說的。
Rashi
for the Lord has spoken—Now where did He speak? (Num. 24:19) “Out of Jacob shall come a ruler, and he shall destroy him that remains in the city.” [from Mechilta Bo 12:16, Pirké d’Rabbi Eliezer ch. 37]
Tze'enah Ure'enah
“The House of Jacob will be a fire and the House of Joseph a flame, etc.” [1:18]. Like the fire burns the straw, so will Jacob burn the nations. Therefore he says, a flame will come out of the house of Jacob and from the house of Joseph a fiery flame will come, when Joseph will overcome Esau.
Tze'enah Ure'enah
“There will be no survivor of the House of Esau, since the Lord has spoken” [1:18]. No person from Esau will remain; when the Holy One says it, it will certainly happen.