עֲשֵׂ֣ה לְךָ֗ שְׁתֵּי֙ חֲצֽוֹצְרֹ֣ת כֶּ֔סֶף מִקְשָׁ֖ה תַּעֲשֶׂ֣ה אֹתָ֑ם וְהָי֤וּ לְךָ֙ לְמִקְרָ֣א הָֽעֵדָ֔ה וּלְמַסַּ֖ע אֶת־הַֽמַּחֲנֽוֹת׃
「你要為自己造兩支銀號，要用錘打成形的工藝造成；這兩支號要歸你用來召集會眾，並使各營起行。
Jerusalem Talmud Shevuot
The minimum of trumpets are two. Then why does the verse say two? that both be equal11Num. 10:1..
Jerusalem Talmud Sanhedrin
The minimum of birds are two. Why does the verse say two? that both be equal154The birds required for the purification of the person healed from skin disease, Lev. 14:4. Babli Yoma 62b, Mishnah Negaˋim 14:1, Sifra Meṣoraˋ Introduction 11.. The minimum of trumpets are two. Why does the verse say two? that both be equal155The trumpets to be sounded at the time of sacrifices, Num. 10:2. Sifry Num. 74..