Cush in Fausset's Bible Dictionary

Cush, "the Benjamite," heading of Psalm 7. An enigmatic title for Saul the Benjamite, with an allusion to the similar sounding name of Saul's father, Kish. Cush or the Ethiopian expresses one black at heart, who" cannot change his skin" or heart (Jeremiah 13:23; Amos 9:7). David in this Psalm 7:4 alludes to Saul's gratuitous enmity and his own sparing "him that without cause is mine enemy," namely, in the cave at Engedi, when Saul was in his power (1 Samuel 24).