"The wages of a hired worker shall not be left with you overnight until the morning"Leviticus 19:13.

It is forbidden to delay the timely payment of a hired worker. A day worker must be given his wages on the night that follows, and a night worker on the day that follows.

This prohibition applies only to a Jewish worker (as opposed to the positive commandment to pay in a timely fashion, which applies to both Jewish and non-Jewish workers).