Reference 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. ');">¹</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. ');">²</span>

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow

Jastrow