Charles Ellicott Commentary Deuteronomy 22:9-11

"Thou shalt not sow thy vineyard with two kinds of seed, lest the whole fruit be forfeited, the seed which thou hast sown, and the increase of the vineyard. Thou shalt not plow with an ox and an ass together. Thou shalt not wear a mingled stuff, wool and linen together." — Deuteronomy 22:9-11 (ASV)

These precepts appear also in Leviticus 19:19, more briefly.