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。
Rashi
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”.
Rashbam
והיו לך למקרא העדה, these trumpets were to be Moses’ personal property to be used to alert the congregation in times of need by blowing in them. A second purpose would be to alert the encamped Israelites to get ready to move on. מסע, the word is a noun similar to נסיעה.
Sforno
עשה לך שתי חצוצרות כסף, seeing that the immediate plan was for the people to journey to the Holy Land without delay, G’d gave the commandment for the trumpets to be used as “Royal trumpet blasts,” announcing the moving of the Tabernacle to a new location, or announcing the arrival of the Tabernacle at its next location. The trumpets would also be blown before battles, as we know from verse 9.