When we think of reminders, we think of post-it notes, email reminders, dentist appointments, usually they focus on us. This verse does speak of this, but calls it a "sign" on the hands of the Israelites. Obviously, you can see your own hand. But, the "reminder on your forehead", especially in a culture that didn't carry mirrors around, and where pools of water were scarce, this "reminder" was for others.
This external thing that they did - commemorating the Passover - was to be a reminder to others around them that God's law was to be flowing from their lips. The interesting thing is that the Law itself had not yet been given. This was preparing the people to make the Law of God central in their lives.
Our Passover is commemorated as we gather to celebrate communion. It is here that we remember the final sacrificial Lamb whose blood was poured out for each of us. This is not only a reminder to ourselves, but a reminder to those around us that we are a people who take in the sacrament and breathe out the words of God. WE are the reminder to this world. Challenging and humbling at the same time.
ThoughtSong: The Waiting "Every Word"

