Jeremiah 51:5

For Israel hath not been forsaken, nor Judah of his God, of the LORD of hosts; though their land was filled with sin against the Holy One of Israel.

Israel hath not been forsaken - as a widow [Hebrew, 'almaan (H488)]. Israel is not severed from her Husband, Yahweh (Isaiah 54:5), by a perpetual divorce.

Though their land was filled with sin - though the land of Israel has been filled with sin - i:e., with the punishment of their sin, devastation. But, as the Hebrew means for, or and therefore, not though, translate, 'and therefore their (the Chaldeans') land has been filled with (the penal consequences of) their sin (Grotius).