"He Who seals the abyss, and opens it again..."

The Nativity of the Theotokos (source)

  
He Who seals the abyss, and opens it again, Who takes up water into the clouds, and makes it rain, You are He, O Lord, Who made the root blossom from the fruitless Anna the holy one, bringing forth as spotless fruit the rod that is the Theotokos.
-from the Canon of Nativity of the Theotokos
  
(source)
  

Most-Holy Theotokos, save us!