Numbers 10:2

עשה לך MAKE THEE etc. — make לך, “for thyself” (on thy own behalf) suggests that they shall blow them in your presence, as before a king, as it is said, (with reference to Moses) (Deuteronomy 33:5) ויהי בישרון מלך “and he was king in Jeshurun”. עשה לך MAKE THEE — from that which is thine own and not from the common funds (Sifrei Bamidbar 72). עשה לך MAKE FOR THYSELF” also suggests: you make them and use them, but no one else. למקרא העדה [THAT THOU MAYEST USE THEM] FOR THE CALLING OF THE ASSEMBLY — i. e. when you wish to speak to the Sanhedrin and the rest of the people and you summon them to assemble unto you, you shall summon them by the trumpets. ולמסע את המחנות AND FOR THE JOURNEYING OF THE CAMPS — at the time of departing on the journeys you shall blow them as a signal. Consequently you must say that they used to travel by a three-fold call: by the command of the Holy One, blessed be He, by the word of Moses (cf. Rashi on v. 18 at the end), and by the sound of the trumpets (Boraitha d’ Mlechet ha-Mishkan s. 13). מקשה OF BEATEN WORK — from a block of silver you shall make them by hammer blows (Sifrei Bamidbar 72).

עֲשֵׂ֣ה לְךָ֗ שְׁתֵּי֙ חֲצֽוֹצְרֹ֣ת כֶּ֔סֶף מִקְשָׁ֖ה תַּעֲשֶׂ֣ה אֹתָ֑ם וְהָי֤וּ לְךָ֙ לְמִקְרָ֣א הָֽעֵדָ֔ה וּלְמַסַּ֖ע אֶת־הַֽמַּחֲנֽוֹת׃

Make thee two trumpets of silver; of a whole piece shalt thou make them: that thou shalt use them for calling the assembly, and for the journeying of the camps.