"You shall surely bury him on the same day"Deuteronomy 21:23.

We are commanded to bury those executed by the courts on the same day of their execution.

The same applies to all dead—every Jewish deceased must be buried on the day of the passing. (This is why a person who died with no one to care for his interment is called a "met mitzvah" (a "mitzvah corpse"), because it is a mitzvah on everyone to ensure that he is buried.)