Pensée juive sur Le Deutéronome 6:9

Devarim Rabbah in Parshat Ki Teytze is explicit about how the commandments accompany man wherever he is, since they apply to food, dress, habitation, commerce, etc., in short to every conceivable matter man may at any time be engaged in.

The 5 physical: (1) You shall teach them to your children. (2) You shall speak in them (3) You shall bind them as a sign on your hand (4) They shall be as Totafot between your eyes. (5) You shall write them upon the doorposts of your house and upon your gates.

I now return to my theme. As the sacrificial service is not the primary object [of the commandments about sacrifice], whilst supplications, prayers, and similar kinds of worship are nearer to the primary object, and indispensable for obtaining it, a great difference was made in the Law between these two kinds of service. The one kind, which consists in offering sacrifices, although the sacrifices are offered to the name of God, has not been made obligatory for us to the same extent as it had been before. We were not commanded to sacrifice in every place, and in every time, or to build a temple in every place, or to permit any one who desires to become priest and to sacrifice. On the contrary, all this is prohibited unto us. Only one temple has been appointed, “in the place which the Lord shall choose” (Deut. 12:26); in no other place is it allowed to sacrifice: comp. “Take heed to thyself, that thou offer not thy burnt-offerings in every place that thou seest” (ibid. 5:13); and only the members of a particular family were allowed to officiate as priests. All these restrictions served to limit this kind of worship, and keep it within those bounds within which God did not think it necessary to abolish sacrificial service altogether. But prayer and supplication can be offered everywhere and by every person. The same is the case with the commandment of ẓiẓit (Num. 15:38); mezuzah (Deut. 6:9; 11:20); tefillin (Exod. 13:9, 16); and similar kinds of divine service.