וַיִּפֹּ֧ל הַגּוֹרָ֛ל מִזְרָ֖חָה לְשֶֽׁלֶמְיָ֑הוּ וּזְכַרְיָ֨הוּ בְנ֜וֹ יוֹעֵ֣ץ ׀ בְּשֶׂ֗כֶל הִפִּ֙ילוּ֙ גּֽוֹרָל֔וֹת וַיֵּצֵ֥א גוֹרָל֖וֹ צָפֽוֹנָה׃ (ס)
And the lot eastward fell to Shelemiah. Then for Zechariah his son, a discreet counsellor, they cast lots; and his lot came out northward.
Rashi
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.