Saint Dieu, Saint Fort, Saint Immortel is the Trisagion, one of the oldest prayers still sung in Christian churches, at the heart of the Eastern liturgies since the 5th century. It is sung here in French.
Holy God, Holy Mighty, Holy Immortal, have mercy on us.
Three names and one plea, repeated the way it has always been repeated: a prayer shaped like breathing, the same words returning until they begin to say themselves.