וַיְדַבֵּ֣ר יְחִזְקִיָּ֗הוּ עַל־לֵב֙ כָּל־הַלְוִיִּ֔ם הַמַּשְׂכִּילִ֥ים שֵֽׂכֶל־ט֖וֹב לַיהוָ֑ה וַיֹּאכְל֤וּ אֶת־הַמּוֹעֵד֙ שִׁבְעַ֣ת הַיָּמִ֔ים מְזַבְּחִים֙ זִבְחֵ֣י שְׁלָמִ֔ים וּמִ֨תְוַדִּ֔ים לַיהוָ֖ה אֱלֹהֵ֥י אֲבוֹתֵיהֶֽם׃ (ס)
Und Hiskia sprach ermutigend zu allen Leviten, die im Dienst des HERRN gut ausgebildet waren. Also aßen sie sieben Tage lang während des ganzen Festes, opferten Friedensopfer und dankten dem Herrn, dem Gott ihrer Väter.
Rashi on II Chronicles
who were experts in the service of the Lord it is appropriate to use the term “expertise” (שֵׂכֶל) in regards to song, as it is written, (above I Chron. 26:14): “And the lot to the east fell to Shelemiah, and Zechariah, his son, a prudent counselor, etc.,” (יוֹעֵץבְּשֵׂכֶל). Hezekiah spoke to their hearts with consolations and pleasant words to encourage them and assist them, in order that they too strengthen the song with expertise for the Lord.
Rashi on II Chronicles
and thanking the Lord over the thanksgiving offerings, and they thanked the Lord for the miracle that He had wrought for them, for the thanksgiving offering comes for a miracle.