It is a mitzvah to pay the wages of an employee on time, and if he delays, he violares a prohibition, as it says “on his day you shall pay his wages, and don’t let the some come upon him” [i.e. set while he is waiting].
Similarly, there is a mitzvah to pay rental on an animal or a utensil on its [proper] time. [The root \שׂכר\ means both hiring per time and rental.] And if it’s delayed, he violates a prohibition, as it says, “do not withhold the pay of the poor and indigent… in his day you shall pay his wages/fee.”
What is “its [proper] time”? If the work was comeplete during the day, its time is the entire day. If the day went past and he didn’t pay him, he violated “on his day you shall pay his wages, and don’t let the some come upon him”. And if the work was completed after the day left [ended] and the night entered [started], its time is the entire night. If the[entire] night passes and he didn’t pay him, he violated “do not rest the work of a hire with you until the morning.” Similarly someone hired for the week, hired for the month, hired for the year — if he leaves his work during the day, he has the time of the entire day and if he leaves the work at night, he has the time of the entire night, and no more.