A yavam performs halitzah for his yevamah, and she is subsequently found to be pregnant and she gives birth:If the child is viable, he is permitted to marry her relatives and she is permitted to marry his relatives, and he does not disqualify her from marrying a priest. If the child is not viable, he is forbidden to marry her relatives and she is forbidden to marry his relatives, and he disqualifies her from marrying a priest.

A yavam marries his yevamah and she is subsequently found to be pregnant, and she gives birth:If the child is viable, he must divorce her and both are obligated to bring a sacrifice; If the child is not viable, he may retain her [as a wife]. If it is doubtful whether it is a nine-months child of the first [husband] or a seven-months child of the second [husband] he must divorce her, and the child is legitimate, and they must bring an asham talui.

If he married her she is his wife in every respect save that her ketubah remains a debt on her first husband’s estate.

The commandment of yibbum is upon the eldest [of the surviving brothers]. If he declines, they pass in turn to all the other brothers. If they decline, they return to the eldest and say to him, “the commandment is upon you; either perform halitzah or yibbum.”

If he wished to suspend [his decision] until a minor becomes of age, or until the eldest returns from a country beyond the sea or [until a brother who was] a deaf-mute or an imbecile [should recover], he is not to be listened to, but is told, “the commandment is upon you; either perform halitzah or yibbum.”

He who performs halitzah with his yevamah, behold he is regarded as one of the other brothers in respect of inheritance. If the father was living, the estate belongs to the father. He who marries his yevamah acquires his brother’s estate. R. Judah said: in either case, if the father was living the estate belongs to the father. He who performs halitzah with his yevamah, he is forbidden to marry her relatives and she is forbidden to marry his relatives: He is forbidden to marry her mother, her mother’s mother and her father’s mother; her daughter, her daughter’s daughter and her son’s daughter; and also her sister while she is alive. The other brothers are permitted. She is forbidden to marry his father and his father’s father; his son and his son’s son; his brother and his brother’s son. A man is permitted to marry the relative of the rival of his halutzah but is forbidden to marry the rival of the relative of his halutzah.

If he performed halitzah for his yevamah, and his brother married her sister and died, she must perform halitzah but may not be taken in yibbum. Similarly if a man divorces his wife and his brother marries her sister and dies behold she is exempt from halitzah and from yibbum.

If the brother of the yavam had betrothed the sister of the shomeret yavam, in the name of Rabbi Judah ben Batera they said: they say to him “Wait until your older brother has done something”. If his brother performed halitzah for her or married her, he may marry his [betrothed] wife. If the yevamah died he may marry his [betrothed] wife. If the yavam died, he must divorce his wife with a get and [release] his brother’s wife by halitzah.

The yevamah shall neither perform halitzah nor be taken in yibbum before three months have passed [since her husband’s death]. Similarly all other women shall be neither be betrothed nor married before three months have passed. Whether they were virgins or non-virgins, whether divorcees or widows, whether married or betrothed. Rabbi Judah said: those who were married may be betrothed [immediately], and those who were betrothed may be married [immediately], with the exception of the betrothed women in Judea, because there the bridegroom was intimate with [his bride]. Rabbi Yose said: all [married] women may be betrothed [immediately] with the exception of the widow because of her mourning.

If four brothers were married to four women, and they died, if the eldest [surviving brother] desires he may contract yibbum with all of them. If a man was married to two women and died, sexual relations or halitzah with one of them exempts her rival. If one of them was eligible [to marry a priest] and one ineligible [to marry a priest], then if he performs halitzah it should be to her who is ineligible, and if he contracts yibbum it may be with her who is eligible.

A man who remarried his divorced wife, or married his halutzah, or married the relative of his halutzah must divorce her, and the child is a mamzer; the words of Rabbi Akiva. But the Sages say: the child is not a mamzer. They agree that where a man married the relative of his divorcee the child is a mamzer.

Who is a mamzer? [The offspring of a union with] any relative with whom cohabitation is forbidden, the words of Rabbi Akiva. Shimon the Yemenite says: [The offspring of any union] for which one is obligated kareth at the hands of heaven; and the halachah is like his words. Rabbi Joshua says: [The offspring of any union] for which one is obligated death at the hands of a court.Rabbi Shimon ben Azzai said: I found a scroll of genealogical records in Jerusalem, and it was written on it, “So-and-so is a mamzer [having been born] from an adulterous woman”, which confirms the view of Rabbi Joshua. If a man’s wife died, he is permitted to marry her sister. If he divorced her and then she died he is permitted to marry her sister. If she was married to another man and died, he is permitted to marry her sister. If a man’s sister-in-law died, he may marry her sister. If he performed for her halitzah and then she died, he is permitted to marry her sister.