Habakkuk says God's eyes are too pure to look upon what?

Answer: Evil

"Your eyes are too pure to look upon evil," Habakkuk prayed, so why was God silent while the wicked swallowed the righteous?

“Your eyes are too pure to look upon evil, and You cannot tolerate wrongdoing. So why do You tolerate the faithless? Why are You silent while the wicked swallow up those more righteous than themselves?”— Habakkuk 1:13 (BSB)