For the source text click/tap here: Ketubot 83
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Steinsaltz tells us:
Aside from the personal relationship that is created between husband and wife at the time of their marriage, the marriage agreement involves agreement between them in other areas, as well. The economic union that the marriage creates is largely open to definition between the two parties. Thus, for example, the husband can choose to concede some of the obligations that his wife has towards him. Ha-kotev le-ishto, the ninth chapter in Massekhet Ketubot, which begins on our daf, deals primarily with two such concessions. The first is a situation where the husband agrees to concede – entirely or partially – his rights to derive benefit from his wife’s property. The second is when he agrees not to demand an oath from her should she demand payment of her ketubah.
We explore the Halachic and legal implications of joint ownership and its iteration in Roman law (the 12 Tables).