Which gospel includes the phrase "You must be born again"?

The phrase "You must be born again" is found in the Gospel of John, specifically in John 3:3, where Jesus speaks to Nicodemus about the necessity of spiritual rebirth for entering the Kingdom of God. This dialogue emphasizes the concept of being born of water and the Spirit, illustrating the transformative process required to have a relationship with God.

John's Gospel often focuses on deep theological themes, including the dual nature of Jesus as both human and divine, and the idea of rebirth reflects the unique spiritual insights presented in this narrative. In contrast, the other Gospels—Matthew, Mark, and Luke—do not contain this specific phrase or context, as they emphasize different aspects of Jesus' life and ministry, such as His teachings, parables, and miracles. By highlighting the necessity of being "born again," John underscores the importance of spiritual renewal, which is central to the Christian faith.