Deuteronomy 22:11 in the World English Bible
You shall not wear clothes of wool and linen woven together.
Context
10 Thou shalt not plow with an ox and an ass together.
11 Thou shalt not wear a garment of divers sorts, as of woollen and linen together.
12 Thou shalt make thee fringes upon the four quarters of thy vesture, wherewith thou coverest thyself.