Revelation 12:3-4 NIV

3 Then another sign appeared in heaven:1 an enormous red dragon2 with seven heads3 and ten horns4 and seven crowns5 on his heads.

References for Revelation 12:3

4 His tail swept a third6 of the stars out of the sky and flung them to the earth.7 The dragon stood in front of the woman who was about to give birth, so that he might devour her child8 the moment it was born.

References for Revelation 12:4