The principle regarding clothing mixtures, as outlined, emphasizes that materials of widely differing character and texture should not be combined. Plant cellulose fibers, such as linen and cotton, and animal protein fibers, like wool and silk, differ significantly in strength, washability, and absorption, and thus should not be mixed. However, combinations within similar fiber types, such as cotton with linen or wool with mohair and silk, are acceptable due to their compatibility. Synthetic fabrics, including Dacron, nylon, polyester, and rayon, can be combined with natural fibers if they are made to have similar characteristics, ensuring they mix well without damaging each other. The concern lies in mixing fibers with markedly different qualities, as such combinations often result in lower quality garments. God desires that manufacturers avoid producing shoddy materials to exploit customers. When selecting clothing, whether pure or mixed, one should aim to purchase the best quality affordable to honor and glorify God, especially for garments worn to church services, while avoiding debt for unaffordable quality.

The directive against wearing garments of mixed materials, specifically wool and linen together, is found in Deuteronomy 22:11 and Leviticus 19:19. This law, known as sha'atnez in Hebrew, meaning mixed stuff, focuses on the prohibition of combining these two fabrics in a single garment. The principle behind this edict may point to separation, reflecting how God desired the physical nation of Israel to remain distinct from surrounding nations. Spiritually, this principle of separation continues to apply, urging believers to maintain purity and avoid entanglement with sin. While adhering to this specific clothing restriction may not be binding under the New Covenant, the underlying call to be set apart as God's special people remains significant, emphasizing a life dedicated to spiritual purity and distinction from worldly influences.

In examining the principles by which we discern the applicability of certain laws, we find specific guidance concerning the mixing of materials in clothing. The law regarding linen and wool illustrates a broader intent beyond its literal application. It specifically prohibits mixing fibers from a vegetable product and an animal product into the same piece of material. However, the spirit of this law expands to a practical application, teaching us to avoid poor quality by not mixing animal and vegetable fibers. The intent is to purchase the best quality one can afford, showing that this principle still holds relevance in guiding our choices.