Most of Jesus's life is told through the four Gospels of the New Testament Bible, known as the Canonical gospels, written by Matthew, Mark, Luke and John. These are not biographies in the modern sense but accounts with allegorical intent. They are written to engender faith in Jesus as the Messiah and the incarnation of God, who came to teach, suffer and die for people’s sins.
There is very little written about Jesus's early life. The Gospel of Luke (2:41-52) recounts that a 12-year-old Jesus had accompanied his parents on a pilgrimage to Jerusalem and became separated. He was found several days later in a temple, discussing affairs with some of Jerusalem’s elders. Throughout the New Testament, there are trace references of Jesus working as a carpenter while a young adult. It is believed that he began his ministry at age 30 when he was baptized by John the Baptist, who upon seeing Jesus, declared him the Son of God.