Heb 8:7

“Whence does appear? In that this the one was cast out, and the other introduced in its place: for it is therefore of force because it is better. For as he says, "If perfection were by" it, "what further need was there, that another priest should rise, after the order of Melchisedec?" (Heb. vii. 11); so also here he used the same syllogism, saying "For if that first covenant had been faultless, then should no place have been sought for the second"; that is, if it made men "faultless." For it is because he is speaking of this that he did not say, "But finding fault with" it, but "But finding fault with them." And "faultless"; that is, useful; not as though it the old Covenant was obnoxious to any charges, but as not being sufficient. He used a familiar form of speech. As if one should say, the house is not faultless, that is, it has some defect, it is decayed: the garment is not faultless, that is, it is coming to pieces. He does not therefore here speak of it as evil, but only as having some fault and deficiency.”

“Same reasoning as in Heb 7:11. faultless--perfect in all its parts, so as not to be found fault with as wanting anything which ought to be there: answering all the purposes of a law. The law in its morality was blameless (Greek, "amomos"); but in saving us it was defective, and so not faultless (Greek, "amemptos"). should no place have been sought--as it has to be now; and as it is sought in the prophecy (Heb 8:8-11). The old covenant would have anticipated all man's wants, so as to give no occasion for seeking something more perfectly adequate. Compare on the phrase "place . . . sought," Heb 12:17.”