"And one people shall be stronger than the other people" (Genesis 25:23). Rabbi Nachman said: at first they would bring wine-libations from Judah, for their wine would not turn sour until they put barley into it, and they would call it simply "vinegar." Now the wine of Edom does not turn sour until they put barley into it, and they call it "Edomite vinegar," to fulfill what is said, "I shall be filled, now that she is laid waste" (Ezekiel 26:2) if this one is filled, that one is laid waste. Rav Nachman bar Yitzchak said: it is derived from here "and one people shall be stronger than the other people."
When One Is Full the Other Lies in Ruins
Yalkut Shimoni on Torah 110:22
וּלְאֹם מִלְאֹם יֶאֱמָץ, אָמַר רַבִּי נַחְמָן, מִתְּחִלָּה הָיוּ מְבִיאִין נְסָכִים מִיהוּדָה שֶׁלֹּא הָיָה יֵינָם מַחְמִיץ עַד שֶׁנּוֹתְנִים לְתוֹכוֹ שְׂעוֹרִין, וְהָיוּ קוֹרִין אוֹתוֹ חֹמֶץ סְתָם. עַכְשָׁיו אֵין יֵינָם שֶׁל אֱדוֹם מַחְמִיץ עַד שֶׁנּוֹתְנִים לְתוֹכוֹ שְּׂעוֹרִים וְקוֹרִין אוֹתוֹ חוֹמֶץ הָאֲדֹמִי, לְקַיֵּים מַה שֶׁנֶּאֱמַר (יחזקאל כו, ב) "אִמָּלְאָה הָחֳרָבָה" אִם מָלְאָה זוֹ חָרְבָה זוֹ, רַב נַחְמָן בַּר יִצְחָק אָמַר מֵהָכָא וּלְאֹם מִלְאֹם יֶאֱמָץ.