en_tn/jer/50/35.md

A sword is against ... and against

Here "sword" represents war. Alternate translation: "War will soon happen to ... and to" (See: rc://en/ta/man/jit/figs-metonymy)

this is Yahweh's declaration

Yahweh speaks of himself by name to express the certainty of what he is declaring. See how you translated this in Jeremiah 1:8. Alternate translation: "this is what Yahweh has declared" or "this is what I, Yahweh, have declared" (See: rc://en/ta/man/jit/figs-123person)