Did Tertullian forbid Christians from being school teachers?

While reading Bruce Shelley's *Church History in Plain Language*, I came across the following quote, in the context of how early Christians separated themselves from the world around them for fear of idolatry: > Tertullian even forbade a Christian to be a schoolteacher, because such teaching involved using textbooks that told the ancient stories of the gods and called for observing the religious festivals of the pagan year. ([page 42](https://books.google.com/books?id=RbfVAQAAQBAJ&pg=PA42)) Shelley doesn't provide a citation for this claim or go into any more detail, so I wonder: - Where does Tertullian say this? - Was the entire profession off-limits, or only certain activities? - Did he also forbid Christians from studying under one of these pagan school teachers?