+ Mk 10: 1-12
He set out from there and went into the district of Judea (and) across the Jordan. Again crowds gathered around him and, as was his custom, he again taught them.
The Pharisees approached and asked, “Is it lawful for a husband to divorce his wife?” They were testing him.
He said to them in reply, “What did Moses command you?”
They replied, “Moses permitted him to write a bill of divorce and dismiss her.”
But Jesus told them, “Because of the hardness of your hearts he wrote you this commandment.
But from the beginning of creation, ‘God made them male and female.
For this reason a man shall leave his father and mother (and be joined to his wife),
and the two shall become one flesh.’ So they are no longer two but one flesh.
Therefore what God has joined together, no human being must separate.”
In the house the disciples again questioned him about this.
He said to them, “Whoever divorces his wife and marries another commits adultery against her;
and if she divorces her husband and marries another, she commits adultery.”
The New American Bible
The Catechism of the Catholic Church
1627 The consent consists in a “human act by which the partners mutually give themselves to each other”: “I take you to be my wife” – “I take you to be my husband.” This consent that binds the spouses to each other finds its fulfillment in the two “becoming one flesh.”
1639 The consent by which the spouses mutually give and receive one another is sealed by God himself. From their covenant arises “an institution, confirmed by the divine law, . . . even in the eyes of society.” The covenant between the spouses is integrated into God’s covenant with man: “Authentic married love is caught up into divine love.”
2364 The married couple forms “the intimate partnership of life and love established by the Creator and governed by his laws; it is rooted in the conjugal covenant, that is, in their irrevocable personal consent.” Both give themselves definitively and totally to one another. They are no longer two; from now on they form one flesh. The covenant they freely contracted imposes on the spouses the obligation to preserve it as unique and indissoluble. “What therefore God has joined together, let not man put asunder.”
2382 The Lord Jesus insisted on the original intention of the Creator who willed that marriage be indissoluble. He abrogates the accommodations that had slipped into the old Law.
1650 Today there are numerous Catholics in many countries who have recourse to civil divorce and contract new civil unions. In fidelity to the words of Jesus Christ – “Whoever divorces his wife and marries another, commits adultery against her; and if she divorces her husband and marries another, she commits adultery” the Church maintains that a new union cannot be recognized as valid, if the first marriage was. If the divorced are remarried civilly, they find themselves in a situation that objectively contravenes God’s law. Consequently, they cannot receive Eucharistic communion as long as this situation persists. For the same reason, they cannot exercise certain ecclesial responsibilities. Reconciliation through the sacrament of Penance can be granted only to those who have repented for having violated the sign of the covenant and of fidelity to Christ, and who are committed to living in complete continence.