Hebrews 7:11

If truly therefore completion were by the Levitical priesthood, (for the people received legislation by it,) what further need according to the order of Melchisedec for another priest to be raised, and not according to the order of Aaron?

Hebrews 8:7

For if that first was faultless, then place was not to be sought for the second.

Galatians 2:21

I put not away the grace of God for if justice through the law, Christ died in vain.

Hebrews 5:6

And also in another he says, Thou a priest forever according to the order of Melchisedec.

Hebrews 7:17-19

For he testifies, Thou a priest forever, according to the order of Melchisedec.

Galatians 4:3

So also we, when we were children, were subjugated under the world's elements:

Galatians 4:9

And now, having known God, and rather known of God, how turn ye again to the weak and poor elements, to which again ye wish anew to be in a servile condition

Colossians 2:10-17

And ye are completed in him, who is the head of all beginning and power:

Hebrews 5:10

Addressed by God the chief priest according to the order of Melchisedec.

Hebrews 6:20

Where the forerunner, Jesus, went in for us, according to the order of Melchisedec, being a high priest forever.

Hebrews 7:15

And it is yet more abundantly manifest: that according to the resemblance of Melchisedec has another priest risen,

Hebrews 7:21

(For they truly without sacrifice sanctioned by solemn oath became priests; but he with the sacrifice sanctioned by solemn oath by him, saying to him, The Lord sware, and will not repent, Thou priest forever, according to the order of Melchisedec:)

Hebrews 8:10-13

For this the covenant which I will set to the house of Israel after those days, says the Lord; giving my laws into their mind, and upon their hearts will I write them: and I will be to them for God, and they shall be to me for a people:

Hebrews 10:1-4

For the law having a shadow of good things about to be, not the same image of the things, with these sacrifices which they bring in yearly in continuance never can render perfect them coming thereto.

Treasury of Scripture Knowledge

Summary

If therefore perfection were by the Levitical priesthood, (for under it the people received the law,) what further need was there that another priest should rise after the order of Melchisedec, and not be called after the order of Aaron?

General references

Bible References

Perfection

Hebrews 7:18
For there is truly an annulling of the command going before by its weakness and unprofitableness.
Hebrews 8:7
For if that first was faultless, then place was not to be sought for the second.
Hebrews 10:1
For the law having a shadow of good things about to be, not the same image of the things, with these sacrifices which they bring in yearly in continuance never can render perfect them coming thereto.
Galatians 2:21
I put not away the grace of God for if justice through the law, Christ died in vain.
Galatians 4:3
So also we, when we were children, were subjugated under the world's elements:
Colossians 2:10
And ye are completed in him, who is the head of all beginning and power:

What

Hebrews 7:26
For such a chief priest became us, holy, innocent, undefiled, separated from sinners, and being higher than the heavens;

Another

Hebrews 7:15
And it is yet more abundantly manifest: that according to the resemblance of Melchisedec has another priest risen,
Hebrews 5:6
And also in another he says, Thou a priest forever according to the order of Melchisedec.
Hebrews 6:20
Where the forerunner, Jesus, went in for us, according to the order of Melchisedec, being a high priest forever.

General references

Numbers 20:26
And strip Aaron of his garments, and put them upon Eleazar his son: and Aaron shall be gathered and die there.