Deuteronomy 22:11 in the King James Version
Thou shalt not wear a garment of divers sorts, as of woollen and linen together.
Context
10 You shall not plow with an ox and a donkey together.
11 You shall not wear clothes of wool and linen woven together.
12 You shall make yourselves fringes on the four corners of your cloak with which you cover yourself.