Jeremiah 31:19

31:19 Surely after that I was turned, I repented; and after that I was instructed, I struck on my thigh: I was ashamed, yes, even confounded, because I did bear the reproach of my youth.
-World English Bible

Other Translation

31:19 Surely after that I was turned, I repented; and after that I was instructed, I smote upon [my] thigh: I was ashamed, yea, even confounded, because I did bear the reproach of my youth.
-King James Version