הלכה על חגיגה 17:7

From the laws of the commandment is that which they, may their memory be blessed, said (Mishnah Peah 1:1 at the beginning) that these sacrifices do not have a measure - that even one would suffice, whether it be an animal or whether it be a bird, a dove or a chick. And that he needs to go up to Jerusalem regardless with a sacrifice in his hand, or with money to buy the sacrifice in Jerusalem. But he is not exempted with [an object that has] the value of money. And [that] if he did not sacrifice his sacrifice on the first day, he is able to make it up for seven full days (Chagigah 9a) - so long as he be there on the first days. And the rest of its details - are [all] elucidated in Tractate Chagigah (see Mishneh Torah, Laws of Festival Offering 1).