Because of the repetitive use of the words “know” and “knowl…

Because of the repetitive use of the words “know” and “knowledge” (Greek gnosis), it is believed that the author of 1 John was writing to combat one of the earliest groups in Christianity (later deemed heretics) that did not believe in the Incarnation of God in the person of Jesus Christ of Nazareth. What was the name of this group that the author of 1 John simply described as “those who would deceive you”?