First, the Jews were still pushing their version of the Levite Priesthood with it's "works" given by God to the Levites "until the Seed should come". This Levitical Priesthood, along with it's sacrificial "Works of the Law" for atonement, was "ADDED" 430 years after Abraham.
Levi wasn't even born yet in Abrahams time. So although Abraham had "God's Laws" and followed them as it is written, he didn't have the Levitical Priesthood to perform "duties, "works" to cleanse his sin. He was justified "apart" for the Law of justification added 430 years later "until the Seed should come".
2 This only would I learn of you, Received ye the Spirit by the "
works of the law", or by the hearing of faith.
These Priesthood "works" for justification of sins were a "shadow" of the Christ's sacrifice. This Priesthood with it's "works" were to lead Israel to the Messiah, the very reason for the sacrificial, ceremonial, "works of the Law" were created and "ADDED" to God's Law in the first place. When the Messiah came, there was no more need for the ceremonies which foreshadowed the Christ's sacrifice,
But the Jews who were "bewitching" the Galatians didn't believe in this Christ. They were still pushing their version of the Levitical Priesthood "works of the Law" for justification of sins.
"Many" preachers today preach falsely that the "works of the Law" mentioned here were the Spiritual Laws of God like His 10 Commandments, Love thy neighbor as thy self, Passover etc. They use a few words in Galatians as the serpent used a few of God's Words to deceive the woman. (Church, wife, bride) Much in the same way the serpent used some of God's Word through the Mainstream Preachers of Christ's time to deceive the Galatians.
They preach Paul is speaking about the entire Law of God when he says;
19 Wherefore then serveth the law? It was added because of transgressions,
till the seed should come to whom the promise was made;
and it was ordained by angels in the hand of a mediator.
Of course if one considers EVERY Word of God we can see this deception. Love God, don't kill, Love you neighbor, it is a deceit to preach that these were not "ADDED" until Moses time, and it is a worse deceit to preach they were only "ADDED" until the Christ should come, and then men don't need them. There are volumes of scriptures which expose this lie, but the best one IMO is this.
"I will put my law in their inward parts, and write it in their hearts";
This is done "AFTER" the SEED comes. And what Laws are to be written? The Levitical Priesthood sacrificial "Works of the Law" for atonement of sins? No. Because they are only "ADDED" until the seed should come. God's Spiritual 10 commandments and laws are written on the hearts of His people. They don't disappear when we find the Christ.
Abraham believed in God enough to trust Him and do as God commanded. But Abraham had sin like all men. So how was His sin cleansed? Did he seek out a Levite Priest of God and have this Priest perform sacrificial "works of the Law" for atonement that God gave through Moses to the Levites?
NO!! Abraham was justified of his sins by "FAITH" which was shown by his works of obedience. He wasn't given the Promise because a Levite Priest killed a bullock without blemish and sprinkled it's blood on the alter as the "ADDED" Law prescribed. This law had not yet been given. He was justified by his "belief in God" which was shown by his obedience. And he is our example of Faith.
Eve is the perfect example of those who say Lord, Lord, but don't do as He instructs, while Abraham is the perfect example of a man who trusted in God's Word enough to follow them. This is the Faith of Abraham.
Gal. 3:
17 And this I say,
that the covenant, that was confirmed before of God in Christ, the law (of justification),
which was four hundred and thirty years after, cannot disannul, that it should make the promise of none effect.
18 For if the inheritance
be of the law, (sins atoned by
Levite Priests "Works of the Law") it is no more of promise: but God gave
it to Abraham by promise.
I know you are not capable of hearing this or discussing it, or even acknowledging it. . But for some reading along, check this understanding will the rest of the Bible and see if it isn't truth.
Don't let the Mainstream Preachers of today "Bewitch" you into following fleshy religious doctrines. Stick with the Christ.
"Man shall Live by Every Word which comes from the mouth of God"