Hebrews 8:7

for if the first alliance had been without defect, there could have been no occasion for the second.

Hebrews 7:11

If therefore the Levitical priesthood, concerning which the people received a law, could have given perfection, what further need was there that another priest should rise, to be named after the order of Melchisedec, and not after the order of Aaron?

Hebrews 7:18

wherefore the preceeding law is abolished for its being weak and useless.

Galatians 3:21

Is the law then opposite to the promises? by no means. for if there had been a law given, which could have given life, certainly justification should have been by the law.

Hebrews 8:6

Our high priest then has obtained a priesthood so much the more excellent, as he is the mediator of a better alliance, established upon better promises.

Treasury of Scripture Knowledge

Summary

For if that first covenant had been faultless, then should no place have been sought for the second.

Bible References

Had

Hebrews 8:6
Our high priest then has obtained a priesthood so much the more excellent, as he is the mediator of a better alliance, established upon better promises.
Hebrews 7:11
If therefore the Levitical priesthood, concerning which the people received a law, could have given perfection, what further need was there that another priest should rise, to be named after the order of Melchisedec, and not after the order of Aaron?
Galatians 3:21
Is the law then opposite to the promises? by no means. for if there had been a law given, which could have given life, certainly justification should have been by the law.