Kesubos 5:2-3

Kesubos 5:2

A virgin is given 12 months from the time of betrothal to prepare for the wedding; the man is also given this time to prepare. A widow is given 30 days. If the time arrived and they still weren’t married, the groom is obligated to support the bride and, if he is a kohein, she can eat terumah. Rabbi Tarfon says that all of her sustenance can come from terumah, while Rabbi Akiva says that half of her sustenance can come from terumah and half from chullin (regular food).

Kesubos 5:3

A man waiting to marry his brother’s widow does not enable her to eat terumah. If she was married for six months when her husband died and she waited for the brother-in-law for six months, or even if she spent a year with the husband minus one day with the brother-in-law, or vice versa, she does not eat terumah. The law in 5:2 that once 12 months have passed the woman eats terumah is the way the law was originally taught; they subsequently enacted that a woman may not eat terumah until the couple actually marries.