"A woman whose husband went overseas, and one came and told her, 'Your husband has died' and she marries [another]..." (Yevamot 87b). Whereas Jewish law requires two witnesses in all matters of criminal and family law, when it comes to freeing a woman who is "chained" to her missing husband, this law is relaxed, allowing the woman to remarry based on the testimony of only one witness.
"G-d did not find a vessel more pleasing for the Jewish people than peace" (Uktzin 3:11). Such is the concluding teaching of the Mishnah. No Jew needs convincing as to the supreme value we place on peace. Such includes not only peace between nations, but peace within a family. There is little that stands in the way of bringing peace and tranquility into a home--from lying (see Yevamot 65b) to erasing the name of G-d (see Bamidbar 5:23) if need be.