2 Chronicles 35:15

15The singers, the descendants of
Asaph: A musician appointed by David to oversee the music used in worship at the Temple; 12 psalms are attributed to Asaph.
Asaph, were at their stations according to the command of David, Asaph, Heman, and Jeduthun the king’s seer. b Also, the gatekeepers were at each gate. c None of them left their tasks because their Levite brothers had made preparations for them.

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