Sirach 9:7
Ben Sira, Ecclesiasticus5 Do not look intently at a virgin, or you may stumble and incur penalties for her. 6 Do not give yourself to prostitutes, or you may lose your inheritance. 7 Do not look around in the streets of a city, or wander about in its deserted sections. 8 Turn away your eyes from a shapely woman, and do not gaze at beauty belonging to another; many have been seduced by a woman's beauty, and by it passion is kindled like a fire. 9 Never dine with another man's wife, or revel with her at wine; or your heart may turn aside to her, and in blood you may be plunged into destruction.
Clement of Alexandria The Instructor 3.4
PaedagogusSo, opening the curtain, and looking keenly round on all that direct their eyes towards them, they show their manners; and often bending forth from within, disgrace this superficial propriety by their dangerous restlessness. Look not round, it is said, in the streets of the city, and wander not in its lonely places. For that is, in truth, a lonely place, though there be a crowd of the licentious in it, where no wise man is present.
Notes and References
"... The eighty-fifth of the Apostolical Canons gives a list of the books of the Hebrew Canon, and adds the first three books of the Maccabees and the Wisdom of Sirach; these last four are not, however, included in the Canon, though the Wisdom of Sirach is specially recommended for the instruction of the young. Again, in the Apostolical Constitutions, 6:14, 15, quotations from Sirach are given with the same formula as those from the books of the Hebrew Canon, but in the list given in 2:57 of the same work, there is no mention of any of the books of the Apocrypha ... The evidence of Clement of Alexandria is conflicting; in his Paedagogus he quotes very often from Sirach, and speaks of it as 'scripture', from which it would evidently appear that he regarded it as canonical Scripture; but, according to Eusebius, Clement reckoned Sirach among the 'Antilegomena', for in speaking of Clement's works he mentions the Stromateis, or 'Medleys', and says: 'He quotes in them passages from the disputed Scriptures, the so-called Wisdom of Solomon, for example, and of Jesus the son of Sirach, and the Epistle to the Hebrews, and those of Barnabas, Clement, and Jude ..."
Charles, R. H. The Apocrypha and Pseudepigrapha of the Old Testament (p. 299) Oxford University Press, 1913