וַֽיִּקְרְב֞וּ רָאשֵׁ֣י הָֽאָב֗וֹת לְמִשְׁפַּ֤חַת בְּנֵֽי־גִלְעָד֙ בֶּן־מָכִ֣יר בֶּן־מְנַשֶּׁ֔ה מִֽמִּשְׁפְּחֹ֖ת בְּנֵ֣י יוֹסֵ֑ף וַֽיְדַבְּר֞וּ לִפְנֵ֤י מֹשֶׁה֙ וְלִפְנֵ֣י הַנְּשִׂאִ֔ים רָאשֵׁ֥י אָב֖וֹת לִבְנֵ֥י יִשְׂרָאֵֽל׃
И головы отцов'Дома семьи Галаадского, сына Мачира, сына Манассии, из семей сыновей Иосифа подошли и говорили перед Моисеем и пред князьями, главами отцов.'дома детей Израиля;
Taanit
but the Fifteenth of Av, what is [its significance]? Rav Yehuda said that Shmuel said, "It is the day that the tribes were permitted to come one into another [in marriage]."
Bava Batra
Said Rabbi Yehudah in the name of Shmuel: [This is] the day that the various tribes were permitted to marry one another. What did they darshen [to permit violating a direct Mitzvah]? (understand based on careful re-examination of wording in scripture) "This is the word" (Numbers 36:1) this work [ruling] will only apply for this generation