For Beth Shammai say: In the evening all men recline and recite (the Shema), and in the morning they stand, it being written (lit.,) "and when you lie down and when you stand," and Beth Hillel say: All men recite in their (own) way, it being written "and when you walk upon the way." If so, what is the intent of "and when you lie down and when you rise"? The time when men (normally) retire, and the time when they (normally) rise.
(Devarim 6:8) "And you shall bind them (as a sign upon your hand"): These (Shema, Vehaya im shamoa, Kadesh li and Vehaya ki yeviacha) are (included) in (the mitzvah of) "binding," but Vayomer (i.e., the mitzvah of tzitzith) is not included in "binding." For it would follow a fortiori (that it is included in "binding"), viz.: If Kadesh li and Vehaya ki yeviacha, which are not included in "repetition," are included in "binding," then Vayomer, which is included in "repetition," how much more so should it be included in "binding"! It is, therefore, written "And you shall bind them" — These are included in "binding," but Vayomer is not included in "binding."