Even if I were righteous, my mouth would condemn me; if I were blameless, it would declare me guilty.
Cross References
Job 9:15For even if I were right, I could not answer. I could only beg my Judge for mercy.
Job 9:29Since I am already found guilty, why should I labor in vain?
Job 15:6Your own mouth, not mine, condemns you; your own lips testify against you.
 Treasury of Scripture
If I justify myself, my own mouth shall condemn me: if I say, I am perfect, it shall also prove me perverse.
justify
Job 9:2
 I know it is so of a truth: but how should man be just with God?
Job 4:17
 Shall mortal man be more just than God? shall a man be more pure than his maker?
Job 32:1,2
 So these three men ceased to answer Job, because he was righteous in his own eyes… 
mine
Job 15:5,6
 For thy mouth uttereth thine iniquity, and thou choosest the tongue of the crafty… 
Job 34:35
 Job hath spoken without knowledge, and his words were without wisdom.
Job 35:16
 Therefore doth Job open his mouth in vain; he multiplieth words without knowledge.
I am perfect
Job 1:1
 There was a man in the land of Uz, whose name was Job; and that man was perfect and upright, and one that feared God, and eschewed evil.
Philippians 3:12-15
 Not as though I had already attained, either were already perfect: but I follow after, if that I may apprehend that for which also I am apprehended of Christ Jesus… 
it shall
Job 33:8-13
 Surely thou hast spoken in mine hearing, and I have heard the voice of thy words, saying, … 
Proverbs 17:20
 He that hath a froward heart findeth no good: and he that hath a perverse tongue falleth into mischief.
1 Timothy 6:5
 Perverse disputings of men of corrupt minds, and destitute of the truth, supposing that gain is godliness: from such withdraw thyself.