1 Chronicles 6:33, 39, 44

These are the men who served and their sons. Of the sons of the Kohathites: Heman the singer the son of Joel, son of Samuel

and his brother Asaph, who stood on his right hand, namely, Asaph the son of Berechiah, son of Shimea

On the left hand were their brothers, the sons of Merari: Ethan the son of Kishi, son of Abdi, son of Malluch