וַיִּשְׁמַ֧ע יְהוֹשֻׁ֛עַ אֶת־ק֥וֹל הָעָ֖ם בְּרֵעֹ֑ה וַיֹּ֙אמֶר֙ אֶל־מֹשֶׁ֔ה ק֥וֹל מִלְחָמָ֖ה בַּֽמַּחֲנֶה׃
И когда Иисус услышал шум людей, когда они кричали, он сказал Моисею: 'В лагере шум войны.'
Rashi
ברעה means WHEN THEY WERE SHOUTING for they were shouting for joy and making merry.
Or HaChaim
וישמע יהושע, "Joshua heard, etc." The expression ברעה needs clarification. What precisely was the "sound" that Joshua heard which he interpreted as the sound of war? In order to understand Moses' response to Joshua one has to have prophetic insight.
Rabbeinu Bahya
את קול העם ברעה, “the sound of the people in its shouting;” the final letter in the word is the letter ה although it should have been the letter ו seeing that the subject is masculine. However, we may see in this an allusion to five different sounds or voices such as described in connection with the idolatrous cults performed in front of the golden image Nebuchadnezzar had made (compare Daniel 3,7). We are told there about five different sounds, “horn, pipe, zither, lyre, psaltery, bagpipe, and more.“ Another meaning of the word ברעה may be that the wordרעה is an allusion to the planet Mars of whose negative and destructive influence on the Israelites Pharaoh had already warned Moses as we pointed out repeatedly, based on Exodus 10,10. This is also why the Israelites (worshipping the calf) used the musical instrument מחול as the music produced by it is reputed to counteract harmful radiations from Mars. This is also why Aaron said to Moses: “you know that the people are ברע,“ i.e. are under the influence of that planet.