The prohibition against wearing garments of mixed wool and linen, as stated in Deuteronomy 22:11 and Leviticus 19:19, highlights a principle of separation. This directive, known in Hebrew as sha'atnez, specifically refers to the combination of wool and linen together. God instructed the Israelites not to wear such mixed fabrics, emphasizing their distinct identity as a holy people chosen by Him. Under the New Covenant, while the physical act of mixing wool and linen may not be binding, the spiritual principle of separation remains vital. We are called to maintain spiritual purity, avoiding the sin that surrounds us, as we are a chosen generation and His own special people. There may also be practical benefits to avoiding such mixtures, as God's instructions often carry inherent wisdom, even if not mandatory today.