"A great sign appeared in heaven: a woman clothed with the sun, and the moon under her feet, and on her head a crown of twelve stars; and she was with child; and she cried out, being in labor and in pain to give birth" (Revelation 12:12).
"When a woman gives birth and bears a male child, then she shall be unclean for seven days" (Leviticus 12:1-2).
In one of his videos Bible student, Scott Clarke, breaks down several biblical passages that pithily relate to the Revelation 12 sign to prove a Pretribulation Rapture. Verses such as Revelation 12:12, Leviticus 12:1-2 and Isaiah 26 are exegeted in light of the event coming on September 23, 2017.
Although I am agnostic concerning the significance of the September 23 event occurring in the heavens, in my opinion, Clarke's research findings are food for thought and his video presentation is lucid, compelling and visually eye-pleasing.
Watch the video here and search the Scriptures yourself.