חֶ֣רֶב לַיהוָ֞ה מָלְאָ֥ה דָם֙ הֻדַּ֣שְׁנָה מֵחֵ֔לֶב מִדַּ֤ם כָּרִים֙ וְעַתּוּדִ֔ים מֵחֵ֖לֶב כִּלְי֣וֹת אֵילִ֑ים כִּ֣י זֶ֤בַח לַֽיהוָה֙ בְּבָצְרָ֔ה וְטֶ֥בַח גָּד֖וֹל בְּאֶ֥רֶץ אֱדֽוֹם׃
The sword of the LORD is filled with blood, It is made fat with fatness, With the blood of lambs and goats, With the fat of the kidneys of rams; For the LORD hath a sacrifice in Bozrah, And a great slaughter in the land of Edom.
Read Kabbalistic (mystical) interpretations of Isaiah 34:6: Zohar and classical Jewish mystical sources, free online.