From the Council of Tours, A.D. 461

Canon II. Although it had been established by our fathers that whatever priest or Levite had been convicted of giving labor to the procreation of children would be kept from the Lord's communion, nevertheless we, applying moderation to this strictness ... have decreed this: that a priest or Levite adhering to conjugal concupiscence (that is, with a spouse previously married) or not ceasing from the procreation of children not ascend to a higher grade, nor presume to offer sacrifice or minister to the people. Let this alone suffice for these, that they not be made alien from communion.

Cf. Canon I of the Council of Toledo, A.D. 400. Such men are reduced to lay communion.

Canon VI. Those who have mingled themselves with sacred virgins by a nefarious union, or have abandoned the purpose of professed religion, let both be held alien from communion, because "if anyone violates the temple of God, God will destroy him," until, coming to their senses from the snare of the devil, by whom they are held captive at his will, they return to the aid of penance.

Cf. Canon XXV of the Council of Arles cited just now.