'Requirement' in the Bible

so that the [righteous and just] requirement of the Law might be fulfilled in us who do not live our lives in the ways of the flesh [guided by worldliness and our sinful nature], but [live our lives] in the ways of the Spirit [guided by His power].

who has become a priest, not on the basis of a physical and legal requirement in the Law [concerning his ancestry as a descendant of Levi], but on the basis of the power of an indestructible and endless life.