In Judaism, the only law concerning which fabrics may be interwoven together in clothing concerns the mixture of linen and wool, called shaatnez; it is restricted in Deuteronomy 22:11 "Thou shalt not wear a mingled stuff, wool and linen together" and Leviticus 19:19, "'...neither shall there come upon thee a garment of two kinds of stuff mingled together.'" There is no explanation for this in the Torah itself and is categorized as a type of law known as chukim, a statute beyond man's ability to comprehend.Josephus suggested that the reason for the prohibition was to keep the laity from wearing the official garb of the priests,while Maimonides thought that the reason was because heathen priests wore such mixed garments. Others explain that it is because God often forbids mixtures of disparate kinds, not designed by God to be compatible in a certain way, with mixing animal and vegetable fibers being similar to having two different types of plowing animals yoked together. And that such commands serve both a practical as well as allegorical purpose, perhaps here preventing a priestly garment that would cause discomfort in a hot climate.
Linen is also mentioned in the Bible in Proverbs 31, a passage describing a noble wife. Proverbs 31:22 says, "She makes coverings for her bed; she is clothed in fine linen and purple." Fine white linen is also worn by angels in the Bible.