The Samaritans were a pagan or more specifically reprobate group of people whom the Jews religiously avoided.
They are believed by bible scholars and historians to be a mixed group having descendants from Israel and Assyria as a result of being taken by the Assyrians from Israel as slaves.
As such the true 'full breed" Jews and the Samaritans did not agree on worship for the Samaritans mixed Jewish understanding and Assyrian religion.
The Jews worshipped at the temple in Jerusalem, but the Samaritans worshipped elsewhere.
Among some of the most notable references in the New Testament include The Lord Jesus speaking to the Samaritan woman, and the story of The Good Samaritan which built on themes of love for ones neighbor in service of God.