"You shall inquire after His dwelling and come there. And there you shall bring your burnt offerings"—Deuteronomy 12:5-6.
We are commanded to satisfy all our pledges on the first festival – of the three biblical festivals: Passover, Shavuot and Sukkot – following the undertaking of the pledge.
This includes all pledged sacrifices, monies, as well as the various mandatory gifts for the poor.