How do we know Jesus' perfection is true?

The perfection of Jesus is seen in His life as described in the Gospels, where He lived sinlessly and was without fault in His words and actions. John 8:46 features Jesus challenging others to find evidence of sin in Him, highlighting His unique righteousness. Furthermore, the requirements for sacrificial offerings in the Old Testament established that only an unblemished sacrifice could atone for sin (Leviticus 22:21). Jesus embodies this as the perfect Lamb of God, fulfilling all righteousness, which is critical for Him to serve as our Savior. His lack of sin means He was a fitting representative to bear the sins of His people without becoming defiled Himself.