וְהָיָה֩ בֵית־יַעֲקֹ֨ב אֵ֜שׁ וּבֵ֧ית יוֹסֵ֣ף לֶהָבָ֗ה וּבֵ֤ית עֵשָׂו֙ לְקַ֔שׁ וְדָלְק֥וּ בָהֶ֖ם וַאֲכָל֑וּם וְלֹֽא־יִֽהְיֶ֤ה שָׂרִיד֙ לְבֵ֣ית עֵשָׂ֔ו כִּ֥י יְהוָ֖ה דִּבֵּֽר׃
און דאָס הױז פֿון יעקבֿ װעט זײַן אַ פֿײַער, און דאָס הױז פֿון יוֹסף אַ פֿלאַם, און דאָס הױז פֿון עֵשָׂו צו שטרױ, און זײ װעלן זײ אָנצינדן און זײ פֿאַרצערן, און קײן איבערבלײַב װעט ניט זײַן פֿון דעם הױז פֿון עֵשָׂו; װאָרום גאָט האָט גערעדט.
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.