Chrysostom on I Corinthians 14:15
Chrysostom comments: “If a man should [while in the Corinthian congregation] speak only in the Persian, or in any other foreign tongue and not understand what he is saying, then, of course, to himself also he would be a barbarian [and] not only to another — from not knowing the meaning of the sound.”
That, however, would be quite absurd! “For there were of old many who had also a gift of prayer, together with a tongue. And they prayed, and the tongue spoke — praying either in the Persian or Latin language.”
All of the various extant patristic fragments [except some in Tertullian II alone], here agree with Chrysostom. See The Nicene and Post-Nicene Fathers: First Series, Eerdmans, Grand Rapids, 1969, XII, p 211 n 1.