We could conclude from the gmara that in the midbar the bnei Israel did bring only 1 korban pessah in 39 years because of arelim.
Did the leviim who kept the mila bring their korban pessah? And if they did not why?
Tosfos in Kedushin (37b, DH "Ho'il") says that no one brought the Korban Pesach during those years, because most people were Areilim at the time (see Atzmos Yosef there). However, the Ritva in Yevamos (72a) argues and says that those who were not Areilim indeed brought the Pesach during those thirty-nine years.
All the best,