A very wise and loving man named John, who was one of Jesus' best friends, wrote a special letter. He sent this letter to his friends who also loved God, to remind them of something very important.

John said, "Dear friends, don't believe everything you hear about God." He taught them to be like truth detectives, testing every teaching to see if it truly came from God. The main question was: "Does this person believe that Jesus came into the world as one of us?"