V. The Epistle to Bishop Basilides.
The question touching women in the time of their separation, whether it is proper for them when in such a condition to enter the house of God, I consider a superfluous inquiry. For I do not think that, if they are believing and pious women, they will themselves be rash enough in such a condition either to approach the holy table or to touch the body and blood of the Lord. Certainly the woman who had the issue of blood of twelve years' standing did not touch the Lord Himself, but only the hem of His garment, with a view to her cure. For to pray, however a person may be situated, and to remember the Lord, in whatever condition a person may be, and to offer up petitions for the obtaining of help, are exercises altogether blameless. But the individual who is not perfectly pure both in soul and in body, shall be interdicted from approaching the holy of holies.
Canon 3.
Moreover, those who are competent, and who are advanced in years, ought to be judges of themselves in these matters. For that it is proper to abstain from each other by consent, in order that they may be free for a season to give themselves to prayer, and then come together again, they have heard from Paul in his epistle.
Canon 4.
As to those who are overtaken by an involuntary flux in the night-time, let such follow the testimony of their own conscience, and consider themselves as to whether they are doubtfully minded in this matter or not. And he that doubts in the matter of meats, the apostle tells us, “is damned if he eat.” In these things, therefore, let every one who approaches God be of a good conscience, and of a proper confidence, so far as his own judgment is concerned. And, indeed, it is in order to show your regard for us (for you are not ignorant, beloved,) that you have proposed these questions to us, making us of one mind, as indeed we are, and of one spirit with yourself. And I, for my part, have thus set forth my opinions in public, not as a teacher, but only as it becomes us with all simplicity to confer with each other. And when you have examined this opinion of mine, my most intelligent son, you will write back to me your notion of these matters, and let me know whatever may seem to you to be just and preferable, and whether you approve of my judgment in these things. That it may fare well with you, my beloved son, as you minister to the Lord in peace, is my prayer.
Source: Miscellaneous Fragments (New Advent)