Related על סוכה 51:16

The watchmen of the city who watch by day are exempt from the law of the sukkah by day, but under obligation by night; those who watch by day and by night are exempted both by day and by night. Travellers are under obligation by night, but exempted by day. Keepers of gardens and parks are exempted both by day and by night.

The watchmen of the city who watch by day are exempt from the law of the sukkah by day, but under obligation by night; those who watch by day and by night are exempted both by day and by night. Travellers are under obligation by night, but exempted by day. Keepers of gardens and parks are exempted both by day and by night.

The writers of books [of the Tanach], of Tefillin (Phylacteries), and of Mezuzot interrupt [their work] to read the Shema, but do not interrupt [their work] for [the] prayer [of Shemoneh Esreh]. Rebbi says, “Just like they do not interrupt [their work] for [the] prayer of [Shemoneh Esreh], so too they do not interrupt [their work] to read the Shema.” Rebbi Chananya Ben Akavya says, “Just like they interrupt [their work] to read the Shema, so too they interrupt [their work] for [the] prayer [of Shmoneh Esreh].” Rebbi Elazar Bar Tzadok said, “When Rabban Gamliel and his Bet Din were in Yavneh, they were involved in the needs of the community and they did not interrupt [their work] in order not to lose [concentration] from their hearts.”