You shall keep my statutes. You shall not let your cattle engender with a diverse kind: you shall not sow your field with mingled seed…
Not only is it forbidden to weave woollen and flaxen threads together into one material to make wearing apparel of it; but, according to the administrators of the law during the second Temple, an Israelite must not mend a woollen garment with a flaxen thread, and vice versa. One of the reasons which the ancient canonists assign for this prohibition is that "wool and linen were appointed for the priests alone." This law is observed by the orthodox Jews to this day.
(C. D. Ginsburg, LL. D.)
Parallel VersesKJV: Ye shall keep my statutes. Thou shalt not let thy cattle gender with a diverse kind: thou shalt not sow thy field with mingled seed: neither shall a garment mingled of linen and woollen come upon thee.
WEB: "'You shall keep my statutes. "'You shall not crossbreed different kinds of animals. "'you shall not sow your field with two kinds of seed; "'neither shall there come upon on you a garment made of two kinds of material.