Audio by Dr. Michael Sokolow

How? If the levir addressed a Maamar to the one and a Maamar to the other, two letters of divorce and one halizah are required. If he addressed a Maamar to one and gave a letter of divorce to the other, [the one] requires a letter of divorce and [the other must perform] the halizah. If he addressed a Maamar to one and cohabited with the other, both require letters of divorce and [one must perform] the halizah. If he addressed a Maamar to one and submitted to halizah from the other, it is necessary for the first to obtain a letter of divorce. If the levir gave a letter of divorce to one as well as to the other, halizah is necessary for both. If he gave a letter of divorce to one and cohabited with the other, [the second] requires a letter of divorce and must also perform the halizah. [If he gave] a letter of divorce to one and addressed a Maamar to the other, [the second] requires a letter of divorce and [one of them must perform] the halizah. [If he gave] a letter of divorce to one and submitted to halizah from the other, there is no validity in any act that follows the halizah.  יבמות 5.4 
כיצד׃ עשה מאמר בזו, ומאמר בזו-- צריכות שני גיטין, וחליצה׃ מאמר בזו, ובעל לזו-- צריכות שני גיטין, וחליצה׃ מאמר בזו, וגט לזו-- צריכות גט, וחליצה׃ מאמר בזו, וחלץ לזו-- הראשונה צריכה גט׃ גט לזו, וגט לזו-- צריכות ממנו חליצה׃ גט לזו, ובעל לזו-- צריכה גט, וחליצה׃ גט לזו, ומאמר לזו-- צריכה גט, וחליצה׃ גט לזו, וחלץ לזו-- אין אחר חליצה כלום
If the levlr submitted to halizah from the one and from the other, or submitted to halizah [from one] and addressed [to the other] a Maamar, gave her a letter of divorce, or cohabited with her; or if he cohabited with the one and with the other, or cohabited [with the one] and addressed [to the other] a Maamar, gave her a letter of divorce, or submitted to her halizah, no act is valid after the halizah. [There is no difference in the Law] whether there was one levir to two sisters-in-law or two levirs to one sister-in-law. יבמות 5.5
חלץ וחלץ, או חלץ ועשה מאמר, נתן גט, ובעל, או בעל ובעל, או בעל ועשה מאמר, נתן גט, וחלץ-- אין אחר חליצה כלום׃ בין יבם אחד לשתי יבמות, בין שני יבמין ליבמה אחת

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