Reference for Deuteronomy 22:12

גְּדִלִ֖ים תַּעֲשֶׂה־לָּ֑ךְ עַל־אַרְבַּ֛ע כַּנְפ֥וֹת כְּסוּתְךָ֖ אֲשֶׁ֥ר תְּכַסֶּה־בָּֽהּ׃ (ס)

Thou shalt make thee twisted cords upon the four corners of thy covering, wherewith thou coverest thyself.