"Divorce has not permitted among the Anabaptists and Mennonites from the earliest times to the mid-20th century except for the cause of adultery, in accordance with the Biblical standard as found in Matthew 19:9, although separation (either legal or privately arranged) was generally allowed.
In a tract entitled Concerning Divorce written by one of the first Swiss Brethren in 1527, possibly by Michael Sattler, appears the earliest known Anabaptist treatment of the subject. The main points in this tract stressed: (1) the permanence of the marriage bond; (2) the supremacy of one's obligation to Christ over obligation to the marriage partner; (3) the only ground for divorce was adultery; (4) to marry one guilty of fornication was itself fornication; (5) the innocent party to a divorce was not forbidden to remarry, and was by implication permitted to do so. Except for the fifth point, regarding which there was some ambiguity and occasional divergence within the brotherhood, this tract can be thought of as summarizing quite well the position of the Mennonite church regarding divorce through the mid 20th century.
Menno Simons also clarified the Anabaptist position on divorce, referring directly to the words of Christ and of the Apostle Paul. He reiterated the theme of adultery being the only acceptable ground for divorce. "And also, that the bond of undefiled, honorable matrimony is so unchangeably bound in the kingdom and government of Christ that neither a man nor a woman can forsake one the other, and take another, understand rightly what Christ says, except it be for fornication, Matthew 19:9. And Paul also holds the same doctrine, that they shall he bound to each other, and that they are to live in union; that the man has not power over his own body, nor the woman over hers, 1 Corinthians 7:4." (Works, 247). The Wismar Resolutions of 1554, (as quoted in Mennonitisches Lexikon I, 530) say: "Adultery on the part of one member breaks the marriage relationship. However, the responsible party may return to re-establish the relationship provided he (or she) gives evidence of due repentance and a changed life. In cases of deliberate adultery, the innocent party may be free to remarry after consulting with the congregation." The position taken by the Hutterian Brethren was ". . . that nothing can break the marriage bond except adultery. In cases where a man is married to an unbelieving woman, and she desires to live with him, he may not divorce her (nor vice versa). If the unbelieving husband threatens her faith or hinders the training of the children in the faith, she may divorce her husband, but must not remarry so long as that man is living."
http://gameo.org/index.php?title=Divorce_and_Remarriage
Michael Sattler :
"He who divorces without fornication, the only reason, and remarries, commits adultery; and he who takes a
divorced woman causes her to commit adultery; for Christ says, "These two are one flesh". But he who cleaves to a
harlot, as Paul says, 1 Cor. 6, sins against his own body and is one flesh with the harlot. Thus he is by this act
separated from his own flesh, in that he has attached himself to the alien flesh of the prostitute, and thus the marriage
is broken; for they are no longer one flesh, since the fornicator has become one flesh with the harlot. The one who
finds herself thereby divorced may now marry, whom she will, only let it be in the Lord..."
Menno Simons:
"These two, one husband and one wife, are one flesh and can not be separated from each other to marry again
otherwise than for adultery, as the Lord says. Matt. 5:19; Mark 10; Luke 16.
