KJV
Matthew 9:13
But go ye and learn what that meaneth, I will have mercy, and not sacrifice : for I am not come to call the righteous, but sinners to repentance.
ESV
Matthew 9:13
Go and learn what this means: ' I desire mercy, and not sacrifice.' For I came not to call the righteous, but sinners.”
Why is “repentance” missing
to answer this we have to go to the previous verse 9:12 in that verse the word “whole” in the King James is replaced by the word “well” in the ESV inferring that there is a Physical Issue when in reality the word “whole” infers spiritual issue.
Whole means to make complete, repentance is how we do that.
Dont worry Matthew 9:13 matches the (Westcott&Hort 1881) NT,RSV,NIV NASB and others.