Reference for Yevamot 20:5
לדבריו קאמר ליה לדידי חייבי לאוין הם וחייבי לאוין בני חליצה ויבום נינהו אלא לדידך חייבי כריתות נינהו לפי שאינן בצרת צרה
not have answered<span class="x" onmousemove="('comment',' Lit., 'and he should say'. ');"><sup>12</sup></span> him<span class="x" onmousemove="('comment',' Resh Lakish. ');"><sup>13</sup></span> [that the brothers] are only subject to the penalties of a negative precept,<span class="x" onmousemove="('comment',' If they married the haluzah, their deceased brother's widow, with whom halizah had been performed by one of them. According to R. Johanan, infra, contrary to the view of Resh Lakish, no penalty of kareth is involved in such a marriage, whether the transgressor be the brother who performed the halizah or any of the other brothers. ');"><sup>14</sup></span>