1,912. Valid and Invalid Maamar
Yibum v’Chalitzah 5:6
If maamar is simply given to a yevama without being preceded by any other action and without being followed by any action other than yibum with the yavam who gave the maamar, it is called a valid maamar. Maamar is considered invalid if: prior to the maamar, this yavam or one of his brothers gave a get to this yevama or one of the deceased’s other widows, or performed chalitzah with her; either this yavam or one of his brothers engaged in marital intimacy with one of the widows before the maamar; after the maamar, either this yavam or one of his brothers gave a get to this yevama or one of the other widows, or performed chalitzah with her; either this yavam or one of his brothers engaged in marital intimacy with one of the other widows, or gave her maamar; one of the other brothers gave maamar or engaged in marital intimacy with this yevama. An invalid maamar is one that preceded or was followed by one of these actions.
Yibum v’Chalitzah 5:7
Accordingly, if a yavam gave a get or performed chalitzah with his yevama and, subsequently, either he or one of his brothers gave maamar to her or another of the widows, or if he engaged in marital intimacy with a yevama or gave her maamar and then he or one of his brothers gave maamar to another of the widows or engaged in marital intimacy with her, the maamar is invalid. This applies to both the first and the second maamar.