Exite sancti*

This incipit cannot be found in the Gregorian repertoire, however in the Graduale di Gaillac (Padova: La Linea Editrice, 2001) Fer. 2 in Letaniis there is the Antiphon Exite sancti ad Dominum Epro populo et pro plebe ista quae circumdedit nos Alleluia, see page 83.