Matthew 7:3 
“Why do you look at the speck of sawdust in your brother’s eye and pay no attention to the plank in your own eye?” 

Sources Used: 

• “What does it mean to have a holier-than-thou attitude?” by GotQuestions (Web Article)
• “What does the Bible say about legalism?” by GotQuestions (Web Article)
• “What does the Bible mean when it says, ‘Do not judge’?” by GotQuestions (Web Article)
• “Why are Christians so judgmental?” by GotQuestions (Web Article)
• “Does the Bible give us permission to judge others?” by Shane Pruitt (Web Article)
• “What is the conviction of sin?” by GotQuestions (Web Article)
• “The conviction of sin–What is it?” by Compelling Truth (Web Article)
• “What Does the Bible Tell Us about Conviction?” by Jennifer Heeren (Web Article)
• Accidental Pharisees by Larry Osborne (Book)