Apostolic Constitutions, Book I 4

1You shall not be as a wanderer and drifter abroad, rambling about the streets, without just cause, to spy out such as live wickedly. But by minding your own trade and employment, endeavour to do what is acceptable to God. And keeping in mind the oracles of Christ, meditate in the same continually. For so the Scripture says to you: You shall meditate in His law day and night; when you walk in the field, and when you sit in your house, and when you lie down, and when you rise up, that you may have understanding in all things. Nay, although you are rich, and so do not want a trade for your maintenance, be not one that wanders about, and walks abroad at random; but either go to some that are believers, and of the same religion, and confer and discourse with them about the lively oracles of God: —