The writer continues to use parallelism in each of these verses, conveying a single idea using two different statements to emphasize security with regard to the natural world, the homestead, and one's descendants. (See: [[rc://en/ta/man/translate/figs-parallelism]])
Here the stones in farmers' fields are spoken of as if they were people that someone could have a covenant with. AT: "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/translate/figs-metaphor]])