Commentaire sur Sanhédrin 7:9
הַבָּא עַל נַעֲרָה הַמְאֹרָסָה, אֵינוֹ חַיָּב עַד שֶׁתְּהֵא נַעֲרָה בְתוּלָה מְאֹרָסָה וְהִיא בְבֵית אָבִיהָ. בָּאוּ עָלֶיהָ שְׁנַיִם, הָרִאשׁוֹן בִּסְקִילָה וְהַשֵּׁנִי בְּחֶנֶק:
Si quelqu'un vit avec une jeune fille fiancée, il n'est pas passible (de lapidation) à moins qu'elle ne soit une jeune fille (na'arah) [et non une mineure, moins de douze ans et un jour, et non une bogereth, plus de douze ans six mois et un jour], vierge, [et pas quelqu'un qui avait eu des relations sexuelles. Et si elle avait eu des relations sexuelles non normatives (c'est-à-dire anales), elle est toujours considérée comme vierge, de sorte que même si dix hommes ont eu de tels rapports avec elle, tous sont passibles de lapidation], fiancés [et non mariés], et en la maison de son père. [Car si son père l'avait livrée aux messagers du mari, celui qui vit avec elle par la suite n'est pas sujet à la lapidation mais à l'étranglement.] Si deux hommes habitaient avec elle, le premier est sujet à la lapidation et le second à l'étranglement.
Bartenura on Mishnah Sanhedrin
English Explanation of Mishnah Sanhedrin
If two men had sexual relations with her, the first is stoned, but the second is strangled.
Mishnah nine deals with a man who has relations with a betrothed virgin.
Deuteronomy 22:23-24 states: “In the case of a virgin who is betrothed to a man if a man comes upon her in town and lies with her, you shall take the two of them out to the gate of that town and stone them.” A man who has sexual relations with a betrothed woman is an adulterer, as is she, and they are both punishable by death. However, unlike a regular adulterer who is punished by strangulation, one who has relations with a betrothed woman is punished with a more serious form of the death penalty, stoning. Our mishnah teaches that in order for the two to be punished by stoning she must be betrothed and not married. She must be a virgin, and she must be a young woman, usually defined as being from the age of 12-12 ½. Older or younger than that and he will only be punished by strangulation. She also must still be residing in her father’s house. If she has already moved to her husband’s house she is considered married and adultery is then punished by strangulation.
If two men commit adultery with her the first is punished by being stoned and the second is punished by strangulation, since by the time he had relations with her she was no longer a virgin.