2 occurrences across the corpus

Apostolic Fathers

Ignatius to Polycarp 1:13

Let not those that seem worthy of credit, but teach other doctrines, disturb thee. Stand firm and immovable, as au anvil when it is beaten upon.

OT Pseudepigrapha

Testament of Judah 3:38

For these things withdraw au from the law of God, and blind the inclination of the soul, and teach arrogance, and suffer not a man to have compassion upon his neighbour.