Final answer:
The angel told the shepherds in Luke 2:12 that the sign of Jesus' birth would be finding a baby wrapped in cloths, lying in a manger.
Step-by-step explanation:
According to Luke 2:12, the angel told the shepherds that a sign would be a baby wrapped in cloths and lying in a manger. This verse is a part of the Nativity narrative where angels announce the birth of Jesus to the shepherds in the field to proclaim the arrival of the Messiah. The sign given by the angel held great significance as it led the shepherds to find Jesus and recognize him as the Christ.