Midrash for Sanhedrin 37:1
ואין עשה דוחה לא תעשה ועשה אלא מן האירוסין אמאי יבא עשה וידחה לא תעשה
and a positive command<span class="x" onmousemove="('comment',' Sc. Her husband's brother shall go in into her and take her to him to wife. Deut. XXV, 5. ');"><sup>1</sup></span> cannot abrogate a positive and a negative command. But in the case of a widow after erusin, why [is he not permitted to marry her]?<span class="x" onmousemove="('comment',' Since he is interdicted only by a negative command, viz., a widow he shall not take, Lev. XXI, 14. ');"><sup>2</sup></span>
Sifrei Devarim
"who have the contention": Let the owner of the (disputed) ox come and stand by his ox.
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