Rashi on Leviticus 19:13/רש"י על ויקרא י״ט:י״ג

1לא תעשק THOU SHALT NOT WRONG [THY FELLOW-MAN] — This refers to one who withholds the wages of a hired servant (Sifra, Kedoshim, Section 2 9; Bava Metzia 61a).

2לא תלין The word תלין is feminine gender and refers to the wages.

3עד בקר UNTIL THE MORNING — Scripture speaks here of a person hired for day-work (שכיר יום) whose departure from work is at sunset. The time for drawing his wages is therefore the whole night (and the law is not infringed provided he pays it before the moment of day break). In another passage (Deuteronomy 24:14) it states, "the sun shall not go down upon it (the man's wages)”. There, however, it is speaking of one hired for night-work (שכיר לילה) the end of whose period of work is at day break, therefore the time for drawing his wages is the whole day (but it must be done before sunset). The reason why he has the whole night or whole day to pay the wages is because the Torah gives the employer the time of one "Ona" (one half of the astronomical day; cf. for the meaning of the word Niddah 65b) to endeavour to obtain the money he requires for paying the wages (Bava Metzia 110b).