וְאָחִ֣יו אָסָ֔ף הָעֹמֵ֖ד עַל־יְמִינ֑וֹ אָסָ֥ף בֶּן־בֶּרֶכְיָ֖הוּ בֶּן־שִׁמְעָֽא׃
And his brother Asaph, who stood on his right hand; even Asaph the son of Berechiah, the son of Shimea;
Read kabbalistic (mystical) interpretation of I Chronicles 6:24: and classical mystical sources.