can you tell me the pasuk?

The exact pasuk is in Yirmiyahu chapter 2, verse 35. The Prophet says in the name of Hashem: "Yet you say, 'I am innocent; His anger will surely turn away from me.' Behold, I am entering into judgment with you because of your saying, 'I have not sinned.'" This is a critical pasuk. Hashem is telling us through the Prophet that He will judge us specifically for claiming we didn't sin. It's not just the sins themselves - it's the denial, the refusal to acknowledge our transgressions, that brings a separate and severe punishment upon us. The Prophet is teaching us that when we become so accustomed to sinning that we no longer recognize it as sin - when we claim "I didn't do anything wrong" - this denial itself becomes its own severe transgression worthy of Divine judgment.