'Unplowed' in the Bible

Ephraim was a well-trained heifer who loved to thresh grain; I myself put a fine yokeon her neck. I will harness Ephraim. Let Judah plow! Let Jacob break up the unplowed ground for himself!

Sow righteousness for yourselves, reap unfailing love. Break up the unplowed ground for yourselves, for it is time to seek the Lord, until he comes and showers deliverance on you.