A Riddle About Tefillin

There was once a signpost that had many of the commandments on it.  Another person noticed it and made the comment "Let's fulfill the commandment this way!" -Deuteronomy 6:8

Who was that man?  And what was the signpost?

Now Israel, you shall listen and be careful to do them, so that it may go well for you and that you may increase greatly, just as the Lord, the God of your fathers, has promised you, in a land flowing with milk and honey.

Hear, Israel! The Lord is our God, the Lord is one!  And you shall love the Lord your God with all your heart and with all your soul and with all your strength.  These words, which I am commanding you today, shall be on your heart.  And you shall repeat them diligently to your sons and speak of them when you sit in your house, when you walk on the road, when you lie down, and when you get up.  You shall also tie them as a sign to your hand, and they shall be as frontlets on your forehead.  You shall also write them on the doorposts of your house and on your gates.

This is the definition of a signpost from the Cambridge English Dictionary

The man was Moses; the humblest man on the face of the earth. -(Numbers 1:23) 

"A pole at the side of a road, especially at a point where two or more roads meet, that gives information about routes and distances."