The Samaritans are among the smallest religious communities in the world with a continuous history, and they are the only one that still performs the Passover sacrifice as the Torah describes it.
Numbers fell to roughly a hundred and fifty people in the early twentieth century and have since recovered to something over eight hundred, living in two communities: one on Mount Gerizim itself and one at Holon, near Tel Aviv. The Gerizim community holds Palestinian identity documents and the Holon community Israeli ones, so the group straddles a political line that has cut through many other things.
Each spring the whole community assembles on the mountain and slaughters sheep at sunset on the fourteenth of the first month, roasts them in pits, and eats them in haste that night with unleavened bread and bitter herbs. Jewish practice has substituted a retold seder for the sacrifice since the temple's destruction, and Samaritan practice has not, because Gerizim is where their sanctuary stood and, in their reading, still is.
The community's size creates practical problems that its priesthood has had to address directly, including a shortage of marriage partners, and it has admitted converts under specific conditions in recent decades. Its own institute publishes population figures annually. A group this small, holding a complete alternative version of the same tradition, is unusually valuable for understanding what the tradition looked like before it settled.