Jesus is the One Man without sin.
For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God. ~2 Corinthians 5:21
How else do we know Who Jesus is as The Man without Sin?
Satan finally left Jesus to find others who would fall in sin when he tempted them
Disaster pursues sinners, but the righteous are rewarded with good. ~Proverbs 13:21
Because Jesus is the Word (Word Made Flesh–John 1:1-3; 14), His Word oozed and exuded from His very being; Scripture was in His heart
I have stored up your word in my heart, that I might not sin against you. ~Psalm 119:11
For the word of God is living and active, sharper than any two-edged sword, piercing to the division of soul and of spirit, of joints and of marrow, and discerning the thoughts and intentions of the heart. ~Hebrews 4:12
Jesus submitted to the Father and resisted temptation
Submit yourselves therefore to God. Resist the devil, and he will flee from you. ~James 4:7
Jesus did not have an unbelieving heart
Take care, brothers, lest there be in any of you an evil, unbelieving heart, leading you to fall away from the living God.
Who is Jesus?