Vedibarta Bam Night and Day

There is a mitzvah to speak about divrei Torah all the time, at home and on the road. There is a Gemara featuring a halachic discussion between Rabbi Akiva, Rabban Gamliel and Rabbi Yehoshua while shopping for meat for Rabban Gamliel’s son’s wedding. From this pasuk—b’shachbecha uv’kumecha—we learn the mitzvah to say Shema twice a day. Although the evening Shema can be said at any time in the night, the daytime Shema must be recited before a quarter of the daylight time is over. One should check a zmanim calendar frequently to ensure that they are always aware of the constantly changing zman krias Shema.

Adapted from Emunah in the Classroom