Related for Sukkah 51:4
ת"ר שומרי העיר ביום פטורין מן הסוכה ביום וחייבין בלילה שומרי העיר בלילה פטורין מן הסוכה בלילה וחייבין ביום שומרי העיר בין ביום ובין בלילה פטורים מן הסוכה בין ביום ובין בלילה
Our rabbis taught: The day watchmen of a town are exempt from the sukkah by day and obligated at night; night watchmen are exempt by night and obligated by day; day and night watchmen are exempt both by day and at night.
Tosefta Sukkah
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.
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