[If] a woman vowed not to derive benefit from her yavam —- [if she vowed so] during her husband's lifetime, we coerce him to perform chalitzah with her; [if she vowed so] after her husband's death, we request of him that he perform chalitzah with her. However, if she intended this, then even [if she vowed] during her husband's lifetime, we [only] request of him that he perform chalitzah with her.