Yosef Karo, Translation:Shulchan Aruch — Orach Chaim 24The Manner of Wearing Fringes and the Reward and…
“ Paragraph 1 — If a person does not wear a garment with four corners then he is not required to wear fringes (tzitzit) . However, it is good and proper that a person should be cautious to wear a small tallit every day, in order that he should remember the mitzvot at every moment. Thus, there are five knots in accordance with the five books of the Torah, and there are four corners, so that in every direction he faces he will also remember. It is proper to wear tzitzit on his garments, and at the very least, it is proper that one should wear tzitzit at the time of prayer. ”
