The writer continues to use parallelism 5:23-25 to emphasize security with regard to the natural world, the homestead, and one's descendants. (See: [[rc://en/ta/man/jit/figs-parallelism]])
Here the stones in farmers' fields are spoken of as if they were people that someone could have a covenant with. Alternate translation: "the stones in your fields will be like people who promise that they will not make any trouble for you" (See: [[rc://en/ta/man/jit/figs-metaphor]])