(3) And Moses said to the people, “Remember this day, on which you went free from Egypt, the house of bondage, how the LORD freed you from it with a mighty hand: no leavened bread shall be eaten. (4) You go free on this day, in the month of Abib. (5) So, when the LORD has brought you into the land of the Canaanites, the Hittites, the Amorites, the Hivites, and the Jebusites, which He swore to your fathers to give you, a land flowing with milk and honey, you shall observe in this month the following practice: (6) “Seven days you shall eat unleavened bread, and on the seventh day there shall be a festival of the LORD. (7) Throughout the seven days unleavened bread shall be eaten; no leavened bread shall be found with you, and no leaven shall be found in all your territory. (8) And you shall explain to your son on that day, ‘It is because of what the LORD did for me when I went free from Egypt.’ (9) “And this shall serve you as a sign on your hand and as a reminder on your forehead—in order that the Teaching of the LORD may be in your mouth—that with a mighty hand the LORD freed you from Egypt. (10) You shall keep this institution at its set time from year to year.
(9) “And this shall serve you as a sign on your hand and as a reminder on your forehead—in order that the Teaching of the LORD may be in your mouth—that with a mighty hand the LORD freed you from Egypt.
(א) והיה לך. יש חולקין על אבותינו הקדושים שאמר כי לאות ולזכרון. על דרך כי לוית חן הם לראשך וענקים לגרגרותיך. גם וקשרתם לאות על ידיך כמו קשרם על לוח לבך תמיד גם וכתבתם על מזוזות ביתך. כמו כתבם על לוח לבך. ומה שיהיה לאות ולזכרון. שיהיה שגור בפיך כי ביד חזקה הוציאך ה' ממצרים.
As a sign on your hand and ... a reminder on your forehead. This might have two explanations. First, after the manner in Prov. 3:3, "Let fidelity and steadfastness not leave you; bind them about your throat, write them on the tablet of your mind." That is, think of them and speak of them frequently. And what is it that must be a "sign"? That with a mighty hand the LORD freed you from Egypt.

