Shulchan Arukh Even HaEzer · Siman 9

English

A woman who was married (Rem"a: or engaged) (Maggid Mishneh ch. 21 and Nimmukei Yosef ch. Haba `Al Yevimto) to two men [sequentially] and they died may not become married to a third, for she is already assumed to be [a woman whose] husbands die. But if she married [a third husband] she need not get divorced, and even if she was [only] engaged, he may marry [her]. And if he is aware of her [as a woman whose husbands die, and nevertheless consents to marry her] she receives a ketubah; [but] if he is unaware of her [past], she gets not ketubah from the third. But from the second [husband whom she married after the first died] she has a ketubah even [if] he was unaware of her. Rem"a: There are those who say that [this law applies] specifically if they died natural deaths, but if one of them was murdered or died in a plague, or fell and died, etc., that doesn't count. And therefore most people are lenient in these matters, and one ought not prevent them [from acting leniently]. (Beit Yosef in the name of a responsum of the Ramban 121, who wrote this in the name of "those who say.") There are those who say that this law applies to a woman who is divorced twice, that one ought not marry her. (Rashi, ch. 10 of Yevamot and the Ra"n in the beginning of ch. Na`arah.) But there are those who say that [this law applies] specifically to dying (Hagahat Maimoni in the name of the Tosafot), and thus is the norm.

English

A man whose two wives die may not prevent himself from marrying a third