Isaiah 41:15

The Lord would transform the helpless worm, a tiny thresher of the soil, into a powerful threshing sledge-by giving her His power. Threshing sledges were heavy wooden platforms fitted with sharp stones and pieces of metal underneath. Farmers dragged them over straw to cut it up in preparation for winnowing. The sledge that Yahweh would make of Israel, however, would be so good that it could chop down mountains and hills, not just straw. The modern equivalent would be giant earth-moving equipment.