Hebrews 8:6 identifies Christ as mediator of the better covenant; verse 7 then argues the first covenant's fault necessitated this second one.

Hebrews 7:11 questions why a new priest was needed if the Levitical priesthood could perfect — paralleling the faultless covenant argument here.

Hebrews 7:18 declares the former commandment set aside as weak and unprofitable — directly supporting the fault of the first covenant here.

Hebrews 9:15 explains that the new covenant redeems transgressions under the first — directly showing why the first covenant was insufficient.

Hebrews 10:9 states that Christ 'does away with the first in order to establish the second' — the exact conclusion drawn from the faultiness of the first covenant.

In Galatians 3:21, Paul uses the same conditional logic: if the law could give life, no need for a different righteousness — echoing the argument that a faultless first covenant would eliminate the need for a second.