Ante-Nicene Fathers, Vol VIII:
Pseudo-Clementine Literature.: Chapter XXVIII

Chapter XXVIII.—Purification.

“However, it is necessary to add something to these things which has not community with man, but is peculiar to the worship of God.  I mean purification, not approaching to a man’s own wife when she is in separation, for so the law of God commands.  But what?  If purity be not added to the service of God, you would roll pleasantly like the dung-flies.  Wherefore as man, having something more than the irrational animals, namely, rationality, purify your hearts from evil by heavenly reasoning, and wash your bodies in the bath.  For purification according to the truth is not that the purity of the body precedes purification after the heart, but that purity follows goodness.  For our Teacher also, dealing with certain of the Pharisees and Scribes among us, who are separated, and as Scribes know the matters of the law more than others, still He reproved them as hypocrites, because they cleansed only the things that appear to men, but omitted purity of heart and the things seen by God alone.