# your iniquity teaches your mouth

"your iniquity is like a teacher and your mouth is like its student" or "it is because of your sin that you speak the way you do"

# your mouth

"you to say what you say". This refers to Job.

# to have the tongue of the crafty

"to speak in the way of crafty people"

# the crafty

This refers to people who harm others by lying to them.