Matthew 23:3

Constitutions of the Holy Apostles Book II

But if any one be convicted as having done a wicked action, such a one not only hurts himself, but occasions the whole body of the Church and its doctrine to be blasphemed; as if we Christians did not practise those things that we declare to be good and honest, and we ourselves shall be reproached by the Lord, that "they say and do not."[47]

The First Epistle of Clement Concerning Virginity

Let us, therefore, fear the judgment which awaits teachers. For a severe judgment will those teachers receive "who teach, but do not,"[109]