Deuteronomy 12:5-6 "And you shall come (to that place) and there, you shall bring your burnt offerings"

Often, your mother cannot go out each time she remembers something she has to buy. She makes a list and does all her shopping when the opportunity arises.

Various occasions and situations obligate a Jew to bring sacrifices to the Beit HaMikdash.

Some people may postpone their trip to Jerusalem because they are unable to travel at that specific time.

The Torah commands us to fulfill those obligations which we have not yet met on the first upcoming holiday: Pesach, Shavuot or Sukkot.

However, it is forbidden to postpone the offering for more than three festivals (See also Negative Mitzvah 155).