בַּיּ֣וֹם הַה֗וּא אָ֣ז נָתַ֤ן דָּוִיד֙ בָּרֹ֔אשׁ לְהֹד֖וֹת לַיהוָ֑ה בְּיַד־אָסָ֖ף וְאֶחָֽיו׃ (פ)
Dann, an diesem Tag, ordinierte David zuerst, dem Herrn durch die Hand Asaphs und seiner Brüder zu danken.
Rashi on I Chronicles
to give thanks to the Lord by the hand of Asaph and his brethren Asaph would commence, “Give thanks to the Lord, call out in His name,” and afterwards all his brethren would respond after him. A similar instance is found in Ezra (Neh. 11:17): “And Mattaniah the son of Micha, the son of Zabdi, the son of Asaph the chief to begin the thanksgiving in prayer,” on the instrument of the huyedoth, as it is written in Ezra (ibid. 12:8): “And the Levites were Jeshua, Binnui, Kadmiel, Sherebiah, Judah, Mattaniah over the huyedoth.”