Verse 4: And seven priests shall bear before the ark seven (Judg. 7:16, 22) trumpets of rams’ horns: and the seventh day ye shall compass the city seven times, and (Num. 10:8) the priests shall blow with the trumpets.
[Trumpets, שׁוֹפְר֤וֹת הַיּֽוֹבְלִים֙] They translate it, trumpets, or horns, of rams, or rams’ (Montanus, Jonathan, Munster, Junius and Tremellius, Pagnine, Symmachus in Masius), from the horn of rams (the Chaldean in Munster, Tigurinus, Vatablus), that is, trumpets made from the horns of rams (Vatablus). This does not satisfy Masius; since rams’ horns are completely solid, but it is necessary that a trumpet be hollow, so that it might be able to be blown into (Masius). Response: That is said as if they could not be hollowed out by art (Drusius). Others: trumpets of remission (Aquila in Drusius), horns of the jubilees (Masius), that is, which emitted a longer and more intense blast; which we are able to name jubilee from JUBAL. Horns of the jubilee years, that is, which they were wont to sound at the beginning of the Jubilee year (Malvenda): trumpets of Jubal (Masius). God commands the sounding of these trumpets, because at this time, as in the Jubilee, He was delivering the land of Canaan, claimed from unjust possessors, to its just and true inhabitants (Lapide). [What things Masius has here concerning Jubal, we have previously set forth for the most part from other authors.]
Of rams’ horns, or, of the jubilees, that is, such trumpets wherewith they were to sound in the years of jubilee, Leviticus 25:9. Either this, or one of the other six, was certainly a sabbath day; and it is not material which was it, for the command of the Lord of the sabbath was sufficient to legitimate any action.
 Hebrew: וְשִׁבְעָ֣ה כֹהֲנִ֡ים יִשְׂאוּ֩ שִׁבְעָ֙ה שׁוֹפְר֤וֹת הַיּֽוֹבְלִים֙ לִפְנֵ֣י הָאָר֔וֹן וּבַיּוֹם֙ הַשְּׁבִיעִ֔י תָּסֹ֥בּוּ אֶת־הָעִ֖יר שֶׁ֣בַע פְּעָמִ֑ים וְהַכֹּ֣הֲנִ֔ים יִתְקְע֖וּ בַּשּׁוֹפָרֽוֹת׃
 יוֹבֵל/Jobel can signify a ram’s horn, or Jubilee, probably because the Jubilee began with the sounding of the ram’s horn, Leviticus 25:9, 10.
 See Genesis 4:21.