There are many readings from Scripture on the Solemnity of Pentecost.
My favorite one is Ezekiel 37:1-14:
The hand of the LORD came upon me, and he led me out in the spirit of the LORD and set me in the center of the plain, which was now filled with bones.
He made me walk among them in every direction so that I saw how many they were on the surface of the plain. How dry they were!
He asked me: Son of man, can these bones come to life? “Lord GOD,” I answered, “you alone know that.”