א הַמֵּבִיא גֵּט שֶׁצָּרִיךְ שֶׁיֹּאמַר: בְּפָנַי נִכְתַּב וּבְפָנַי נֶחְתַּם, וְכֵן הָעֵד הָאֶחָד שֶׁהֵעִיד לְאִשָּׁה שֶׁמֵּת בַּעְלָהּ, לֹא יִשָּׂאֶנָּה מִשּׁוּם חֲשָׁד; וְאִם כָּנַס, לֹא יוֹצִיא. אֲבָל הַמֵּבִיא גֵּט, שֶׁאֵינוֹ צָרִיךְ לוֹמַר: בְּפָנַי נִכְתַּב וּבְפָנַי נֶחְתַּם, מֻתָּר לִשָּׂא אוֹתָהּ, כֵּיוָן שֶׁאֵינָהּ נִשֵּׂאת עַל פִּיו. וּשְׁנֵי עֵדִים הַמְּעִידִים לְאִשָּׁה שֶׁמֵּת בַּעְלָהּ, מֻתָּר אֶחָד מֵהֶם לִשָּׂא אוֹתָהּ, שֶׁאֵין שְׁנַיִם מְצוּיִם לַחֲטֹא בִּשְׁבִיל אֶחָד. וְעַיֵּן בְּטוּר זֶה עַצְמוֹ סִימָן קמ"א. הַגָּה: בִּתְשׁוּבַת הָרֹא"שׁ שֶׁהֵבִיא בא"ע. וְיֵשׁ אוֹמְרִים דְּאַף בִּשְׁנַיִם, אַף עַל גַּב דְּשָׁרֵי, מִכָּל מָקוֹם בַּעַל נֶפֶשׁ יַרְחִיק מִזֶּה (הַגָּהוֹת מַיְמוֹנִי פֶּרֶק י' דְּגֵרוּשִׁין וְכָל בּוֹ וְתוֹסָפוֹת דִּיבָמוֹת):
1 One who brings a divorce document who must say: "In front of me it was written and in front of me it was signed," and likewise a single witness who testified for a woman that her husband died, may not marry her because of suspicion [that he lied in order to marry her]; but if he married her, he need not divorce her. But one who brings a divorce document who needn't say: "In front of me it was written and in front of me it was signed" [i.e. he is just the messenger and not a witness to its writing or signing] is permitted to marry her, since she is not [eligible to] marry based on his word. And two witnesses who testify for a woman that her husband died, it is permitted for one of them to marry her, since two people don't ordinarily sin for the sake of one [of them]. And see this in this Tur [Even haEzer] 141. Rema: In the responsum of the Ro"sh that he brought in Even haEzer. And there are those who say that even with two [witnesses testifying about the death of her husband], although it is permitted [for one of them to marry her], in any case a pious person will distance himself from this. (Hagahot Maimoni ch. 10 of Gerushin, Kol Bo, and Tosafot on Yevamot.)