Leviticus 19:19, Deuteronomy 22:11

Shatnez: wool and linen

What is written

You shall not wear clothes of wool and linen woven together.

Deuteronomy 22:11

The practical question

This one sits quietly until a homestead becomes productive enough to make its own cloth. Keep sheep and grow flax, both of which a self-sufficient household naturally moves toward, and the command becomes a daily manufacturing constraint rather than a point of doctrine.

Questions that follow: does it apply to blends in bought clothing, to bedding and household textiles, to a wool garment sewn with linen thread? Any household planning to spin and weave needs this settled before it sets up a loom.