וַיְהִי֩ בַיּ֨וֹם הַשְּׁלִישִׁ֜י בִּֽהְיוֹתָ֣ם כֹּֽאֲבִ֗ים וַיִּקְח֣וּ שְׁנֵֽי־בְנֵי־יַ֠עֲקֹב שִׁמְע֨וֹן וְלֵוִ֜י אֲחֵ֤י דִינָה֙ אִ֣ישׁ חַרְבּ֔וֹ וַיָּבֹ֥אוּ עַל־הָעִ֖יר בֶּ֑טַח וַיַּֽהַרְג֖וּ כָּל־זָכָֽר׃
Ora, nel giorno terzo, mentre quelli erano in dolore, due dei figli di Giacobbe, Simeone e Levi, fratelli di Dina, presero ciascheduno la propria spada, assalirono a man salva la città, ed uccisero ogni maschio,
Rashi on Genesis
שני בני יעקב TWO OF THE SONS OF JACOB — They were his sons (the sons of Jacob, a wise and clever man), but they acted as any man named Simeon and Levi would do — as other people would do who were not his sons — for they did not take counsel with him (Genesis Rabbah 80:10).
Rashbam on Genesis
בהיותם כואבים, according to normal reactions of people to such an operation, and according to the plain meaning of the text, the meaning is that they had been in pain during the first and second day after the circumcision, and they were now in even greater pain,
Sforno on Genesis
ויהרגו כל זכר, these men had not circumcised themselves in order to become Jews and embrace monotheism but only in order to lay their hands on the vast possessions of the family of Yaakov, as their leaders Chamor and Shechem had promised them.