"look not on our sins, but on the faith of your Church"

". . . ne respicias peccata nostra, sed fidem Ecclesiae tuae. . . ."

     The peace, Communion rite, Roman Missal.

     Marie-Thérèse Nadeau, on pp. 103-106 of Foi de l’église:  évolution et sens d’une formule, Théologie historique 78 (Paris:  Beauchesne, 1988), follows the scholarship back into early 11th-century Germany, or, more specifically, "an ordinary of the Mass of Minden c. 1030," Wolfenbüttel, Herzog August Bibliothek, Cod. Guelf. 1151 Helmst. (105).  In the 1570 Missal of Pius V (and probably earlier) it was one of three prayers said by the priest in private just before communion (104):

. . . ne respicias peccata mea sed fides Ecclesiae tuae. . . .