Bede the Venerable
Catena Aurea · Lukasevangelium 12
In the mean time, when there were gathered together an innumerable multitude of people, insomuch that they trode one upon another, he began to say unto his disciples first of all, Beware ye of the leaven of the Pharisees, which is hypocrisy. For there is nothing covered, that shall not be revealed; neither hid, that shall not be known. Therefore whatsoever ye have spoken in darkness shall be heard in the light; and that which ye have spoken in the ear in closets shall be proclaimed upon the housetops.
Or He says this, because all the things which the Apostles of old spoke and suffered amid the darkness of oppression and the gloom of the prison, arc now that the Church is made known through the world and their acts are read, publicly proclaimed. The words, shall be proclaimed on the housetops, are spoken according to the manner of the country of Palestine, where they are accustomed to live on the housetops. For their roofs were not after our way raised to a point, but flat shaped, and level at the top. Therefore He says, proclaimed on the housetops; that is, spoken openly in the hearing of all men.