Jesus is the kind of Supreme Priest we need, because he was sinless.

Hebrews 7:26-28

26 Jesus is the kind of Supreme Priest that we need. He was holy; he did no wrong; he was completely innocent. God has now taken him up to the highest heaven separated from living among sinners. 27 The other Supreme Priests need to sacrifice animals day by day as well as year by year. They do this, firstly, to atone for their own sins, and then to atone for other people who have sinned. But because Jesus never sinned, he does not need to atone for his own sin. The only thing he needed to do to save people was to sacrifice himself once! 28 We need a Supreme Priest like him, because in the laws that God gave Moses [PRS] the ones who would be appointed to be priests would be men who tended to sin easily. But God solemnly declared [PRS] after he had given his laws to Moses that he would appoint ◄his Son/the man who is also God► to be a Supreme Priest. Now ◄his Son/the man who is also God► has forever become all that God intends him to be.