32 Therefore, that no one should take these words in a carnal sense, and by these words should conceive in his mind certain choral bands of wantonness, he continues and says, “In the Churches bless ye the Lord”: as though he were saying, wherefore, when you hear of damsels, players on timbrels, do ye think of wanton pleasures? “In the Churches bless ye the Lord.” For the Churches are pointed out to you by this mystic intimation: the Churches are the damsels, with new grace decked: the Churches are the players on the timbrels, with chastened flesh being spiritually tuneful. “In the Churches,” then, “bless ye the Lord God from the wells of Israel.” For from thence He first chose those whom He made wells. For from thence were chosen the Apostles; and they first heard, “He that shall have drunk of the water that I shall give him, shall never thirst, but there shall be made in him a well of water springing unto life everlasting.”
Source: The Enarrations, or Expositions, on the Psalms (New Advent)