In his prayer of confession, Ezra said Israel's iniquities had risen higher than what?

Answer: Their heads

Ezra prayed, "Our iniquities are higher than our heads, and our guilt has reached the heavens," mourning the people's unfaithfulness.

“and said: “O my God, I am ashamed and embarrassed to lift up my face to You, my God, because our iniquities are higher than our heads, and our guilt has reached the heavens.”— Ezra 9:6 (BSB)