en_tn_lite_do_not_use/1ch/09/33.md

they were free from work

AT: "they did not have to do other work" (See: rc://en/ta/man/translate/figs-idiom)

had to carry out their assigned tasks

AT: "had to complete their assigned task"

day and night

This means "at all times" and can be translated using a phrase or word from your language or culture that gives the same meaning. (See: rc://en/ta/man/translate/figs-merism)

These were family leaders among the Levites, as listed in their genealogical record

AT: "The family history lists included the names of these Levite family leaders"