en_tn_condensed/jer/51/48.md

over Babylon ... come for her

"over the Babylonians ... come for them ... the Babylonians have made ... their land"

the heavens and the earth

Heaven and earth are viewed as if they were people.

this is Yahweh's declaration

"this is what I, Yahweh, have declared". Yahweh speaks of himself to express the certainty of what he is declaring. See Jeremiah 1:8.