נָ֥חָה שָׁקְטָ֖ה כָּל־הָאָ֑רֶץ פָּצְח֖וּ רִנָּֽה׃
Jetzt ruhen aus, rasten alle Völker der Erde! Sie jubeln laut auf.
Rashi on Isaiah
opened [their mouth] in song This is the song they recited, “All the land rested, became tranquil.”
Ibn Ezra on Isaiah
Is at rest, since the death of the King of Babylon.
Ibn Ezra on Isaiah
פצחו They break forth. The root פצח in Arabic means to speak poetically.