לֹֽא־תִרְאֶה֩ אֶת־שׁ֨וֹר אָחִ֜יךָ א֤וֹ אֶת־שֵׂיוֹ֙ נִדָּחִ֔ים וְהִתְעַלַּמְתָּ֖ מֵהֶ֑ם הָשֵׁ֥ב תְּשִׁיבֵ֖ם לְאָחִֽיךָ׃
Thou shalt not see thy brother’s ox or his sheep driven away, and hide thyself from them; thou shalt surely bring them back unto thy brother.
Mishnah Kilayim
Only that which is spun or woven is forbidden under the law of kilayim, as it says, “You shall not wear shatnez” (Deuteronomy 22:1, that which is shua (combed) tavui (spun) and nuz (woven). Rabbi Shimon ben Elazar says: [the word shaatnez means that] he [the transgressor] is perverted (naloz) and causes his father in heaven to avert himself [from him].