Deuteronomy 22:8-12

22:8 If you build a new house, you must construct a guard rail around your roof to avoid being culpable in the event someone should fall from it.

Illustrations of the Principle of Purity

22:9 You must not plant your vineyard with two kinds of seed; otherwise the entire yield, both of the seed you plant and the produce of the vineyard, will be defiled. 22:10 You must not plow with an ox and a donkey harnessed together. 22:11 You must not wear clothing made with wool and linen meshed together. 22:12 You shall make yourselves tassels for the four corners of the clothing you wear.