When did they start?

 

פרשת השבוע עקב   When did they start wearing תפילין? The מבי"ט writes* "Even though it seems that the Yidden  were commanded in מצרים to wear תפילין, they could not have done so until after they arrived in ערבות מואב when they received the two פרשיות of שמע- והיה אם שמוע." The רשב"א writes** that since they were commanded in מצרים to wear תפילין we must assume that the פרשיות of שמע- והיה אם שמוע were handed over to them in מצרים but only appeared in the Torah in משנה תורה בית אלקים שער היסודות פ' ל"ז* חידושי הרשב"א מנחות ל"ד ע"א**