Shared ground
Hebrews 7:15–19 argues that a new priesthood is clearly in view because “another priest” arises “like Melchizedek.” The basis for this priest is not a rule grounded in physical descent (“a fleshly commandment”) but the effective power of an “endless” (indestructible) life (vv. 15–16). The writer backs this with Scripture’s public testimony: “You are a priest forever” (v. 17).
The passage also states that an earlier command is set aside because it proved “weak and useless,” explained by the line, “the law made nothing perfect” (vv. 18–19). In its place comes “a better hope,” and the stated outcome of that hope is access: “through which we draw near to God” (v. 19). In the flow of Hebrews 7, this is part of the case that Jesus’ priesthood surpasses the Levitical system (Hebrews 7).
Where interpretation differs
1) What “a fleshly commandment” refers to (v. 16).
Some read this narrowly as the ancestry-based requirements that regulate Levitical priests (who can serve because they come from a particular line). Others read it more broadly as the whole set of regulations that structure priestly service under the law (including sacrifices and purity rules), all of which are tied to mortal, bodily life.
2) How broad the “annulling” is (v. 18).
Some take “annulling of a foregoing commandment” as specifically targeting the command that establishes and governs the Levitical priesthood, without claiming that every command in the law is canceled. Others think the writer is signaling a wider change in the law’s governing authority, because priesthood is central and changing it implies a larger shift (building on v. 12).
3) What “the law made nothing perfect” means (v. 19).
Some interpret “perfect” mainly as full access to God in worship (the law could not bring final nearness). Others include a wider sense of completing God’s intended goal for dealing with sin and restoring people, so the law’s arrangements were real but not final.
Why the disagreement exists
The passage uses broad-sounding statements (“weak and useless,” “made nothing perfect”) but also speaks of a specific “foregoing commandment.” That creates a question of scope: is the writer making a focused point about priesthood regulations, or a more sweeping claim about the law’s role after the arrival of the forever-priest? The immediate context pushes toward priesthood and access, while the wording can feel expansive.
What this passage clearly contributes
Explicitly, the text grounds the new priest’s legitimacy in “forever” life rather than lineage (vv. 15–17). It also explicitly says an earlier command is set aside because it could not achieve its intended endpoint (“made nothing perfect”) and that a “better hope” replaces it, resulting in nearness to God (vv. 18–19). The theological inference the writer encourages is that the enduring priesthood is not merely different in form; it is more effective in accomplishing what the earlier arrangement could not—bringing people to God.