Passalorynchites
Charles Buck Theological Dictionary [1]
A branch of the Montanists. They held, that in order to be saved, it was necessary to observe a perpetual silence; wherefore they kept their finger constantly on their mouth, and dared not open it, even to say their prayers. Their name is derived from the Greek, a nail, and a nostril, because, when they put their finger to their mouth, they touched their nose.
Cyclopedia of Biblical, Theological and Ecclesiastical Literature [2]
a party of Montanists who observed perpetual silence, giving literal obedience to Psalms 141:3 : "Set a watch, O Lord, before my mouth; keep the door of my lips." Jerome found some of them in Galatia, obeying this miserable literalism. Their name is derived from the Greek Πάσσαλος , a nail, and Ῥίν . A Nostril, because when they put their finger to their mouth, which they did to keep their mouth from giving utterance to their thoughts, they touched their nose. The Passalorynchites did not even pray audibly.