Because God's children are human beings – made of flesh and blood – Jesus also became flesh and blood by being born in human form. For only as a human being could he die, and only by dying could he break the power of the Devil, who had the power of death.
Therefore, it was necessary for Jesus to be in every respect like us, his brothers and sisters, so that he could be our merciful and faithful High Priest before God. He then could offer a sacrifice that would take away the sins of the people.