en_tn_condensed/jer/50/04.md

In those days and at that time

These phrases emphasize the importance of that future time. See Jeremiah 33:15.

this is Yahweh's declaration

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

seek Yahweh their God

Seeking Yahweh their God represents either asking God for help or thinking about God and obeying him. The author sometimes uses the term "Israel" to refer to the people of the northern kingdom of Israel, and at other times to the nation of Israel as a whole. He switches between these uses without warning the reader.