מִדִּבְרֵי סוֹפְרִים שֶׁלֹּא יָבֹא הַיָּבָם עַל יְבִמְתּוֹ עַד שֶׁיְּקַדֵּשׁ אוֹתָהּ בִּפְנֵי שְׁנֵי עֵדִים בִּפְרוּטָה אוֹ בִּשְׁוֵה פְּרוּטָה וְזֶהוּ הַנִּקְרָא מַאֲמָר. וְאֵין הַמַּאֲמָר קוֹנֶה בַּיְבָמָה קִנְיָן גָּמוּר כְּמוֹ הַבִּיאָה. וְהָעוֹשֶׂה מַאֲמָר בִּיבִמְתּוֹ שֶׁלֹּא מִדַּעְתָּהּ לֹא עָשָׂה כְּלוּם שֶׁאֵין הָאִשָּׁה מִתְקַדֶּשֶׁת אֶלָּא לִרְצוֹנָהּ. וּקְטַנָּה מִן הָאֵרוּסִין אֵין עוֹשִׂין בָּהּ מַאֲמָר אֶלָּא מִדַּעַת אָבִיהָ:
It is a Rabbinic ordinance that a yavam should not enter into marital relations with his yevamah until he consecrates her in the presence of two witnesses, with a p'rutah or an article worth a p'rutah. This [act] is called a ma'amar. A ma'amar does not complete the acquisition of a yevamah, as will be explained. When [a yavam] performs a ma'amar with his yevamah without her knowledge, his deed is of no consequence. For a woman can be consecrated only willingly. When a minor is widowed after being merely consecrated, a ma'amar can be performed only with the consent of her father.
