וְעִמָּהֶם֙ הֵימָ֣ן וִֽידוּת֔וּן וּשְׁאָר֙ הַבְּרוּרִ֔ים אֲשֶׁ֥ר נִקְּב֖וּ בְּשֵׁמ֑וֹת לְהֹדוֹת֙ לַֽיהוָ֔ה כִּ֥י לְעוֹלָ֖ם חַסְדּֽוֹ׃
Y con ellos á Hemán y á Jeduthún, y los otros escogidos declarados por sus nombres, para glorificar á SEÑOR, porque es eterna su misericordia;
Rashi
to Jeduthun The name of one of the singers, and there was also a musical instrument called Jeduthun. According to the Midrash Aggadah (Song Rabbah 4:1 [4]): concerning the edicts (דתות) and concerning the distressing laws and decrees that are decreed upon Israel.