Linen: Mosaic Law Forbade Its Being Interwoven with Wool
Source: Nav
Leviticus 19:19
You are to keep My statutes. You shall not crossbreed two different kinds of livestock; you shall not sow your fields with two kinds of seed; and you shall not wear clothing made of two kinds of material.
Deuteronomy 22:11
Do not wear clothes of wool and linen woven together.