The flesh of Jesus was holy because He was the Son of God.
Luke 1:35
King James Version
35 And the angel answered and said unto her, The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God.
He is sinless like Adam.
Both born sinless
Both Sons of God
Both with free choice